Letters 114.12

You may rather wonder that not only the effects of vices, but even vices themselves, meet with approval. For it has ever been thus: no man’s ability has ever been approved without something being pardoned. Show me any man, however famous; I can tell you what it was that his age forgave in him, and what it was that his age purposely overlooked. I can show you many men whose vices have caused them no harm, and not a few who have been even helped by these vices. Yes, I will show you persons of the highest reputation, set up as models for our admiration; and yet if you seek to correct their errors, you destroy them; for vices are so intertwined with virtues that they drag the virtues along with them.

Seneca, Letters to Lucilius 114.12, translated by Richard Mott Gummere