A quote
Some men have made a distinction as follows, saying: “If a man has self-control and wisdom, he is indeed at peace as regards the attitude and habit of his mind, but not as regards the outcome. For, as far as his habit of mind is concerned, he is not perturbed, or saddened, or afraid; but there are many extraneous causes which strike him and bring perturbation upon him.”
Seneca·Letter 85 — On Some Vain Syllogisms (§14)·trans. Gummere