Cicero's Tusculan Disputations

Do you, then, think that it can befall a wise man to be oppressed with grief, that is to say, with misery? for, as all perturbation is misery, grief is the rack itself. Lust is attended with heat, exulting joy with levity, fear with meanness, but grief with something greater than these; it consumes, torments, afflicts, and disgraces a man; it tears him, preys upon his mind, and utterly destroys him: if we do not so divest ourselves of it as to throw it completely off, we cannot be free from misery.