Part 11

Let us then first examine the central thought of Plato’s philosophy—the “doctrine of ideas.” Developing the doctrines of earlier philosophers, especially those of Heraclitus and Anaxagoras, Plato held that the world is dual. In it is the phenomenal world visible to us, which includes all natural objects and those made by man, a transient and unreal world which we know only through our senses. But beside it, or rather behind it, is another world invisible but permanent and real, which can be grasped only by the reason. This is the world of ideas. Yet the two worlds are not separate, for the world of the senses owes its existence wholly to its dependence on the world of ideas. To understand Plato’s view we must consider in an elementary way what he meant by “ideas.” The words which he uses (εἶδος, ἰδέα) signify “form,” and in logic are used in the sense of “class,” “kind,” “species,” “the general principle for the classification of objects.” The translation “idea” is traditional, and there is no adequate reason for preferring “form” or any other English equivalent. Now Plato’s statement that the world of phenomena depends on the invisible world of ideas seems at first sight paradoxical, for by it he means that the individual tree, book, desk, chair, good man, or whatever you please, is not the real being at all, but that the ideas of tree, book, desk, chair, and goodness alone possess reality. It may be made plain by an illustration which shall be Plato’s own. At the beginning of the tenth book of the Republic Socrates and Glaucon are conversing together. The master wins Glaucon’s assent first to the proposition that although there are many beds and tables in the world, there are only two ideas, one of a bed, the other of a table. He then goes on to show that the workman makes a bed or table by shaping his material according to the idea of a bed or a table, but that he does not create the ideas themselves. That is done by God who is the real maker of the real bed, that is, of the idea of a bed. The carpenter makes only the particular bed which owes its temporary existence to the eternal idea—the real bed—which is in Nature, in the mind of God. Or if Plato should appear before us tonight, he might say, “Suppose we take a dozen books of different sizes and different shapes and appearance, how do we recognize that these diverse objects are all books?” Then when we hesitated to give an answer, as we probably should, he would reply, “It is because each one of these individual books partakes of the idea of book. The idea is present in the individual example and thereby gives the individual its existence; the individual depends therefore on the idea, not the idea on the individual. If this dozen, or indeed if all the books in the entire world were to be destroyed, the idea of book would still remain, and new books could be made by causing the materials, out of which books are constructed, to partake of the idea of book. That is, all individual books are transitory, impermanent, unreal; the idea of book is permanent, eternal, it alone has reality; and all individual things, therefore, exist, so far as they have any real existence, only by partaking of the ideas. So all things come into being and owe their existence to sharing in the eternal ideas.”

We should be unjust to Plato if we thought that he regarded this doctrine as a perfect explanation of the relation between the visible and invisible worlds. Far from holding such a view he himself evidently held it to be a “guess at truth,” which served to show in its way that there is a permanent reality behind the phenomena of the visible world and a truth which is beyond sense. Indeed Plato is very conscious of troublesome questions which arise in connection with the doctrine, and in three dialogues—his Philebus, Parmenides, and Sophist—he endeavors to meet some of these questions, and there he offers admirable criticism of his own views.

With reference to the source of the doctrine, as I have said above, we cannot tell how much Plato derived from Socrates or how much he developed for himself. Socrates was evidently always searching for universals, trying to determine what goodness is in itself in contrast to the goodness embodied in a good man, what are virtue, courage, and such qualities. The teacher or the pupil may have extended the ideas, the universals, to include all things, even the humble articles of furniture which are the examples in the Republic. But in any case by this doctrine of “ideas,” “forms,” Plato secured a basis for reality, a means of attaining absolute knowledge in contrast to that relative knowledge, which according to the Sophists was the utmost which man could attain. Plato would have quite agreed with Protagoras that if the senses were our only avenues to knowledge, then indeed man would be the measure of all things and his knowledge would be limited to the transient phenomenal world; that is, he could have no knowledge of reality; but by apprehending through our reason the ideas—that is, the realities—on which the phenomenal world depends, we can gain genuine knowledge and free ourselves from subjection to mere opinion.

Plato also teaches that there are various grades of ideas, some being subordinate to others; the highest of all is that of the Good, identified by him with the Beautiful. This supreme idea is at once the cause of all existence and knowledge, and comprehends within itself all other ideas; as the sun in the visible world, so in the world of true knowledge the Good “is the universal author of all things right and beautiful, itself the source of truth and intelligence.” It is the Absolute, the universal Reason, God.[190]

We have seen that Plato sets the world of ideas apprehended by reason over against the world of phenomena, known to us through our senses. The latter world is material, the former immaterial. This concept of the immateriality of ideas was something new in philosophy. Anaxagoras had thought his formative principle (Νοῦς), as his predecessors had thought theirs, to be as material as the “seeds” out of which all things were made; but Plato developed an immaterial, an ideal world, wherein are found all cause and all reality.

Now the Platonic ideas are apprehended by the human intellect. What are the consequences of this fact? It must follow that man’s reason has a nature similar to that of the ideas; like them it must belong to the world which is above the senses; and with them it must partake of the Absolute. But Plato shows that the ideas are eternal and immortal, and draws therefrom the logical conclusion that man’s intellect, his reasoning soul, likewise knows no creation and is free from death.

However he is not content to let the matter rest on this argument alone, but he supports the doctrine of immortality by many proofs, as in the Phaedrus where Socrates explains: “The soul through all her being is immortal, for that which is ever in motion is immortal; but that which moves another and is moved by another, in ceasing to move, ceases also to live. Only the self-moving, as it never leaves itself, never ceases to move and is the fountain and beginning of motion to all that moves besides.”[191] In the Phaedo[192] he represents Socrates as offering a number of different arguments to his questioning friends. One of these is that by which he first proves that souls exist before they are domiciled in our bodies, for recollection implies a previous existence, and since men can recall and recognize things which they have never seen or been taught in their present existence, it follows that they have been born with this knowledge, so that what we call learning is after all only a recollection of ideas gained in a previous existence. Socrates concludes his argument with the question: “Then may we not say, Simmias, that if, as we are always repeating, there is an absolute beauty, and goodness, and an absolute essence of all things; and if to this, which is now discovered to have existed in our former state, we refer all our sensations, and with this compare them, finding these ideas to be pre-existent and our inborn possession—then our souls must have had a prior existence, but if not, there would be no force in the argument?” To this his hearers give ready assent. In the Meno this same argument is very adroitly drawn from the realm of mathematics.[193] An untutored slave is made to “recollect” that the square of the hypothenuse of an isosceles right-angled triangle is equal to twice the square of one of its sides. This is the doctrine of recollection to which Wordsworth has given beautiful expression in his familiar lines:

Our birth is but a sleep and a forgetting: The soul that rises with us, our life’s star, Hath had elsewhere its setting, And cometh from afar; Not in entire forgetfulness, And not in utter nakedness, But trailing clouds of glory do we come From God, who is our home.

But as Simmias and Cebes in the Phaedo point out, this doctrine only shows that the soul existed before the body; it does not prove that the soul is immortal. Socrates therefore goes on to prove this further point, largely by showing the simple and unchanging nature of the soul which is like that of the ideas, and he therefore concludes that since it cannot admit of change, it must be free from death. Again he argues that since the soul can rule and use the body as it will, it must be anterior to the body and hence have an eternal and never ending existence.[194] The final and apparently most convincing proof to Plato’s mind, in spite of its dialectic character, is that the notion of life cannot be separated from the soul, for the soul is that which gives life; therefore since a dead soul is an impossibility, we must agree that the soul is immortal.[195] To follow out in detail the other arguments would occupy too much time now, interesting as it might prove. Indeed if we were to rehearse all of Plato’s proofs of the immortality of the soul, we should run through practically the entire gamut of the arguments which have ever been offered. His frequent return to the subject indicates the importance which he gave to the belief.

Before we approach Plato’s ethical and religious views we must glance for a moment at his psychology, for on that depends in no small measure his moral system. In the fourth book of the Republic when discussing the different forms of government, Socrates is made to show that the soul has three parts or elements: the first is the divine or rational part (τὸ θεῖον, τὸ λογιστικόν) whose seat is in the head, the second, the courageous or passionate element (τὸ θυμοειδές) residing in the heart, and the third is the appetite (τὸ ἐπιθυμητικόν) which belongs to the diaphragm or liver.[196] In the Phaedrus[197] this same division is set forth in a myth. Now when in an individual all three parts are in accord under the leadership of reason, whose orders are enforced by courage on appetite, the man is virtuous; but if appetite and courage unite against reason, discord results and the man is vicious. As the state is well ordered when harmony exists among its parts, so harmony of the soul, led by the reason, produces the virtuous human being. In the earlier dialogues the soul is evidently regarded as a unit, so that the parts are really forms or manifestations of the soul; all three are immortal. But in the Timaeus only the reason is immortal, the other parts being separable and bound to the body with which they die.[198] Now we have already seen that the soul, or at least its rational part, being divine and immortal, has an affinity for the eternal ideas and is endowed by a natural love for the true, the beautiful, and the good. It is therefore impelled toward the divine world of ideas by a natural passion, and this effort on the part of man’s reason is philosophy. The true philosopher then is the lover of truth and reality, who is absorbed in the pleasures of the soul so that he will hardly be conscious of bodily pleasure; indeed he will not think much of human life or even fear death.[199] The soul, however, in its effort to mount into the realm of the ideas, is held back by the body in which it is imprisoned and fettered in the world of the senses. Thus we find in Plato the Orphic belief that man has a dual nature, made up of a divine soul and a mortal hindering body. We shall presently see how he gave to the emotional belief of that sect a philosophic basis and so transformed it into a reasonable article of morality and religion.

Now we may consider Plato’s moral and religious views. The highest good for man, according to his teaching, is likeness to God—that is, the largest possible participation in the ideas of the Good which are in the Absolute. In direct proportion to the success of the rational soul in appropriating to itself these ideas, the man will practise justice and holiness, that is, be righteous; but inasmuch as the world of ideas cannot be apprehended by the senses, the rational soul of the philosopher must always try to escape from the world of the senses where evils dwell. As Socrates in the Theaetetus[200] assures Theodorus: “Evils, Theodorus, can never pass away; for there must always remain something which is antagonistic to the good. Having no place among the gods in heaven, of necessity they hover around the mortal nature and this earthly sphere. Wherefore we ought to fly away from earth to heaven as quickly as we can; and to fly away is to become like God, so far as this is possible; and to become like him is to become holy, just, and wise ... God is never in any way unrighteous—he is perfect righteousness; and he of us who is the most righteous is most like him.... To know this is true wisdom and virtue; and ignorance of this is manifest folly and vice.” The man, then, whose soul strives to become like God will inevitably be righteous. Plato’s philosophy thus results in practical morality.

Furthermore we are assured in the Republic that a seeker after righteousness will not be neglected by the gods, for Socrates there says:[201] “Then this must be our notion of the just man, that even when he is in poverty or sickness or any other seeming misfortune, all things will in the end work together for good to him in life and death: for the gods have a care of any one whose desire is to become just and be like God, so far as man can attain the divine likeness, by the pursuit of virtue.”

The path by which man is to attain to likeness of God, and so to freedom from his lower nature, is that of a noble asceticism which Socrates described to Simmias and Cebes the night before his own death:[202] “No one who has not studied philosophy and who is not entirely pure at the time of his departure is allowed to enter the company of the gods, but the lover of knowledge only. And this is the reason, Simmias and Cebes, why the true votaries of philosophy abstain from all fleshly lusts, and hold out against them and refuse to give themselves up to them, not because they fear poverty or the ruin of their families, like the lovers of money and the world in general; nor like the lovers of power and honour, because they dread the dishonour or the disgrace of evil deeds.”

“No, Socrates, that would not become them,” said Cebes.

“No indeed,” he replied, “and therefore they who have any care of their own souls, and do not merely live moulding and fashioning the body, say farewell to all this; they will not walk in the ways of the blind: and when philosophy offers them purification and release from evil, they feel that they ought not to resist her influence, and whither she leads they turn and follow.”

“What do you mean, Socrates?”

“I will tell you,” he said. “The lovers of knowledge are conscious that the soul was simply fastened and glued to the body—until philosophy freed her, she could only view real existence through the bars of a prison, not in and through herself; she was wallowing in the mire of every sort of ignorance, and by reason of lust had become the principal accomplice in her own captivity.” And a little later Socrates says: “The soul of the true philosopher thinks that she ought not to resist this deliverance (which philosophy offers), and therefore abstains from pleasures and desires and pains and fears, so far as she is able.”

Somewhat earlier in the dialogue Socrates had stated in still more emphatic terms the necessity of putting the body aside if man’s soul would attain real knowledge:[203] “For if while in company with the body the soul cannot have pure knowledge, one of two things follows—either knowledge is not to be attained at all, or if at all, after death. For then, and not till then, the soul will be parted from the body and exist in herself alone. In this present life, I reckon that we make the nearest approach to knowledge when we have the least possible intercourse or communion with the body, and are not surfeited with the bodily nature, but keep ourselves pure until the hour when God himself is pleased to release us. And thus having got rid of the foolishness of the body we shall be pure and shall hold converse with the pure, and know of ourselves the clear light everywhere, which is no other than the light of truth.” As the phrase, “until the hour when God himself is pleased to release us,” shows, man might not hasten the time of his release by his own act. And in other places, in familiar ways, Plato teaches that man may not desert the station where god has set him on guard until the command is given.

Finally in the Cratylus,[204] where Socrates in discussing the origin and nature of language indulges in some serious fooling in connection with the name of the soul (ψυχή), he says that he imagines that those who first gave the soul its name “psyche,” (ψυχή), wished to express the truth that the soul when in the body is the source of life, and gives the body the ability to breathe and revive, and that when this power fails the body, then it perishes and dies. As for body, he reminds his interlocutor that that word (σῶμα) is variously interpreted, some saying that it is the grave (σῆμα) of the soul, which may be regarded as in a tomb during this present life; and he adds that the Orphic poets were probably the ones who invented the name, for they had the notion that the embodied soul is suffering punishment for sin, and that the body is a prison in which the soul is incarcerated until the penalty of sin is paid. Likewise in the Gorgias[205] Socrates refers to the same Orphic idea and quotes a verse from Euripides: “Who knows whether life be not death and death life?” That is, this death in life is due to the body which tends to strangle the soul. Only when the reasoning soul has escaped from this tomb of the flesh can it really live. This is the reason why the true philosopher is always pursuing death in the sense that he is trying to free his soul, so far as may be, from the concerns of the body that it may enjoy life at its best.[206]

I have used Plato’s own words thus extensively for they set forth more eloquently than any words of mine the essential features of his doctrine. It requires no argument to show how great his debt to the Orphics and Pythagoreans was. But we cannot fail to see that he went far beyond his predecessors, for to their emotional belief in the immortality of the soul he gave an intellectual basis, by showing that the rational soul is of the same nature and substance as the Absolute, and therefore immortal and ever striving to apprehend the Absolute to which it belongs. In place of the external purifications and simple taboos which made up the Orphic course of life, Plato substitutes a noble discipline, reminding us of St. Paul—a discipline which has for its aim nothing less than the likening of man’s soul to God. When Plato teaches that man must begin his immortality here “by the practice of death,” we now see that he really means the practice of life; for life can only begin when the soul is released from its bodily tomb.

From the Orphics and Pythagoreans Plato adopted also the doctrine of the transmigration of souls. According to his view a thousand years—ten times the longest span of human life—elapsed between death and rebirth, during which the wicked received their ten-fold punishment and the righteous their like reward. When the time to return on earth came around, the souls were allowed to choose their new life as they pleased, only the wicked souls, “which had never seen the truth,” could not pass into the bodies of men. The choice made and their next destiny determined, the souls passed to the plain of Forgetfulness where each must drink of the river of Lethe; in the darkness of midnight there was an earthquake and thunderstorm, and the souls were driven, like shooting stars, to their birth. Ten thousand years were required to complete the round of rebirths and to allow the soul to return to its heavenly home. But the soul of a philosopher, “guileless and true,” might secure release after three rebirths if each time he had chosen the higher life. Some incurable sinners were not allowed to return to earth, but when their souls approached the mouth of the cavern which led to the upper world, the mouth gave a mighty roar and drove them back, while fiends tortured them with all the sufferings which a fertile imagination could devise. The path of salvation therefore lay in following righteousness and justice, in choosing the good, that is, in true philosophy. At the close of the Republic Socrates relates the vision of Er the Pamphylian whose soul returned with a report of the other world, and so concludes: “And thus, Glaucon, the tale has been saved and has not perished, and will save us if we are obedient to the word spoken; and we shall pass safely over the river of Forgetfulness and our soul will not be defiled. Wherefore my counsel is, that we hold fast ever to the heavenly way and follow after justice and virtue always, considering that the soul is immortal and able to endure every sort of good and every sort of evil. Thus shall we live dear to one another and to the gods, both while remaining here and when, like conquerors in the games who go round to gather gifts, we receive our reward. And it shall be well with us both in this life and in the pilgrimage of a thousand years which we have been describing.”[207]

With regard to the ultimate fate of the soul Plato is not wholly clear; but apparently he held that with the exception of those who had done unpardonable wrongs the souls of men, when their wanderings and rebirths were over and they had attained to purity, returned to God, to the universal reason; probably, however, he thought of their return as being without loss of individuality, for Plato lays so much stress on the individual soul that we cannot believe that he would have allowed it to lose its personality in the Absolute.

This account, I trust, for all its imperfections, is sufficient to indicate what a great advance Plato made in his concept of the spiritual life. Man’s reason is now made the means and agent of his spiritual ascent; the reasoning soul, by its own nature, strives to seek its own, and so finds its goal by virtue of its reason. The human will is not neglected in the Platonic system, but it is by no means made prominent. Man’s salvation is attained when the soul through the exercise of its reason has risen superior to its bodily prison, freed itself of the imperfections and evils which are necessarily associated with the body, and purified has attained to God’s likeness.