Letters 104.25

And in these visions what is there, I say, as fear-inspiring as rumour has proclaimed? Why, pray, my dear Lucilius, should a man fear toil, or a mortal death? Countless cases occur to my mind of men who think that what they themselves are unable to do is impossible, who maintain that we utter words which are too big for man’s nature to carry out.

Seneca, Letters to Lucilius 104.25, translated by Richard Mott Gummere