Letter 123 — On the Conflict Between Pleasure and Virtue (§9)

“Just as those who have attended a concert carry about in their heads the melodies and the charm of the songs they have heard—a proceeding which interferes with their thinking and does not allow them to concentrate upon serious subjects,—even so the speech of flatterers and enthusiasts over that which is depraved sticks in our minds long after we have heard them talk. It is not easy to rid the memory of a catching tune; it stays with us, lasts on, and comes back from time to time. Accordingly, you should close your ears against evil talk, and right at the outset, too; for when such talk has gained an entrance and the words are admitted and are in our minds, they become more shameless.”