George Washington's Rules of Civility Traced to their Sources and Restored by Moncure D. Conway
Chapter vii. 10. Ne vous amusez pas à considerer curieusement les
defauts ou les taches, quoy que naturelles, particulierement si elles se rencontrent au visage, & ne vous enquerez pas d'où elles out precedé. Ce que vous diriez bien volontiers en l'oreille à vn amy, doit estre conserué sous la clef du sil[~e]ce, lors que vous vous trouuez en cempagnie
Take no pleasure in examining curiously defects or blemishes, although natural, especially if they be in the face, nor enquire what they proceed from. What you would readily say in the ear of a friend ought to be preserved under the key of silence when you are in society.
72d. Speak not in an unknown Tongue in Company but in your own Language and that as those of Quality do and not as y'e Vulgar; Sublime matters treat Seriously.