To fear death, gentlemen, is no other than to think oneself wise when one is not, to think one knows what one does not know. No one knows whether death may not be the greatest of all blessings for man, yet men fear it as if they knew that it is the greatest of evils. And surely it is the most blameworthy ignorance to believe that one knows what one does not know. It is perhaps on this point and in this respect, gentlemen, that I differ from the majority of men, and if I were to claim that I am wiser than anyone in anything, it would be in this, that, as I have no adequate knowledge of things in the underworld, so I do not think I have. I do know, however, that it is wicked and shameful to do wrong, to disobey one’s superior, be he god or man. I shall never fear or avoid things of which I do not know, whether they may not be good rather than things that I know to be bad. (29b)
Plato. Five Dialogues (Apology). Trans. G.M.A. Grube. Hackett Publishing 1981.