Letters 13.3

So then, to keep up my figure, Fortune has often in the past got the upper hand of you, and yet you have not surrendered, but have leaped up and stood your ground still more eagerly. For manliness gains much strength by being challenged; nevertheless, if you approve, allow me to offer some additional safeguards by which you may fortify yourself.

Seneca, Letters to Lucilius 13.3, translated by Richard Mott Gummere