A quote
I received great pleasure from your letter; kindly allow me to use these words in their everyday meaning, without insisting upon their Stoic import. For we Stoics hold that pleasure is a vice. Very likely it is a vice; but we are accustomed to use the word when we wish to indicate a happy state of mind.
Seneca·Letter 59 — On Pleasure and Joy (§1)·trans. Gummere