Letters 85.30

“That which is evil does harm; that which does harm makes a man worse. But pain and poverty do not make a man worse; therefore they are not evils.” “Your proposition,” says the objector, “is wrong; for what harms one does not necessarily make one worse. The storm and the squall work harm to the pilot, but they do not make a worse pilot of him for all that.”

Seneca, Letters to Lucilius 85.30, translated by Richard Mott Gummere