Letters 59.3

Accordingly, when our Vergil speaks of

The evil joys of the mind,

his words are eloquent, but not strictly appropriate. For no “joy” can be evil. He has given the name “joy” to pleasures, and has thus expressed his meaning. For he has conveyed the idea that men take delight in their own evil.

Seneca, Letters to Lucilius 59.3, translated by Richard Mott Gummere