Letters 104.22

Live with Chrysippus, with Posidonius: they will make you acquainted with things earthly and things heavenly; they will bid you work hard over something more than neat turns of language and phrases mouthed forth for the entertainment of listeners; they will bid you be stout of heart and rise superior to threats. The only harbour safe from the seething storms of this life is scorn of the future, a firm stand, a readiness to receive Fortune’s missiles full in the breast, neither skulking nor turning the back.

Seneca, Letters to Lucilius 104.22, translated by Richard Mott Gummere