text: I have thus answered your demand, although it came under the head of subjects which I include in my volumes On Moral Philosophy. Reflect, as I am often wont to tell you, that there is nothing in such topics for us except mental gymnastics. For I return again and again to the thought: "What good does this do me? Make me more brave now, more just, more restrained! I have not yet the opportunity to make use of my training; for I still need the physician. Why do you ask of me a useless knowledge? You have promised great things; test me, watch me! You assured me that I should be unterrified though swords were flashing round me, though the point of the blade were grazing my throat; you assured me that I should be at ease though fires were blazing round me, or though a sudden whirlwind should snatch up my ship and carry it over all the sea. Now make good for me such a course of treatment that I may despise pleasure and glory. Thereafter you shall teach me to work out complicated problems, to settle doubtful points, to see through that which is not clear; teach me now what it is necessary for me to know!" Farewell.