Letters 104.26

But how much more highly do I think of these men! They can do these things, but decline to do them. To whom that ever tried have these tasks proved false? To what man did they not seem easier in the doing? Our lack of confidence is not the result of difficulty; the difficulty comes from our lack of confidence.

Seneca, Letters to Lucilius 104.26, translated by Richard Mott Gummere