Letters 71.25

But give me an unspoiled and sturdy-minded young man; he will pronounce more fortunate one who sustains on unbending shoulders the whole weight of adversity, who stands out superior to Fortune. It is not a cause for wonder that one is not tossed about when the weather is calm; reserve your wonderment for cases where a man is lifted up when all others sink, and keeps his footing when all others are prostrate.

Seneca, Letters to Lucilius 71.25, translated by Richard Mott Gummere