Letters 66.44

The same thing holds true, I assure you, concerning goods; you will find one amid circumstances of pure pleasure, another amid sorrow and bitterness. The one controls the favours of fortune; the other overcomes her onslaughts. Each is equally a good, although the one travels a level and easy road, and the other a rough road. And the end of them all is the same: they are goods, they are worthy of praise, they accompany virtue and reason. Virtue makes all the things that it acknowledges equal to one another.

Seneca, Letters to Lucilius 66.44, translated by Richard Mott Gummere