Letters 66.52

Why should I not reckon this good among the primary goods, and deem it in so far greater than those other goods which are unattended by danger and have made no trial of fortune, as it is a rarer thing to have overcome a foe with a hand lost than with a hand armed? “What then?"” you say; “shall you desire this good for yourself?” Of course I shall. For this is a thing that a man cannot achieve unless he can also desire it.

Seneca, Letters to Lucilius 66.52, translated by Richard Mott Gummere