Plato,
Apology, Crito, and Phaedo of Socrates
“ For no one knows but that death is the greatest of all good to man; but men fear it, as if they well knew that it is the greatest of evils. And how is not this the most reprehensible ignorance, to think that one knows what one does not know? But I, O Athenians! in this, perhaps, differ from most men; and if I should say that I am in any thing wiser than another, it would be in this, that not having a competent knowledge of the things in Hades, I also think that I have not such knowledge. ”
