Moral Letters to Lucilius Section 7

Illud, mi Lucili, non est quod te inpediat, quo minus de nobis bene speres, quod malitia nos iam tenet, quod diu in possessione nostri est; ad neminem ante bona mens venit quam mala. Omnes praeoccupati sumus. Virtutes discere vitia dediscere est.

Crois-moi, Lucilius, ne renonce pas à bien espérer de nous par le motif que la contagion nous a déjà saisis et nous tient dès longtemps sous son empire. Chez personne la sagesse n’a précédé l’erreur : chez tous la place est occupée d’avance. Apprendre les vertus n’est que désapprendre les vices.

There is nothing, Lucilius, to hinder you from entertaining good hopes about us, just because we are even now in the grip of evil, or because we have long been possessed thereby. There is no man to whom a good mind comes before an evil one. It is the evil mind that gets first hold on all of us. Learning virtue means unlearning vice.