Real joy, believe me, is a stern matter. Can one, do you think, despise death with a care-free countenance, or with a "blithe and gay" expression, as our young dandies are accustomed to say? Or can one thus open his door to poverty, or hold the curb on his pleasures, or contemplate the endurance of pain? He who ponders these things in his beart is indeed full of joy; but it is not a cheerful joy. It is just this joy, however, of which I would have you become the owner; for it will never fail you when once you have found its source. The yield of poor mines is on the surface; those are really rich whose veins lurk deep, and they will make more bountiful returns to him who delves unceasingly. So too those baubles which delight the common crowd afford but a thin pleasure, laid on as a coating, and even joy that is only plated lacks a real basis.
Seneca, Epistle XXIII