It’s a great thing and always to be studied: when that inescapable hour arrives, go out with a calm mind. - Seneca

Tell me what to avoid, what to seek, by what studies to strengthen my tottering mind, how I may rebuff the waves that strike me abeam and drive me from my course, by what means I may be able to cope with all my evils, and by what means I can be rid of the calamities that have plunged in upon me and those into which I myself have plunged. Teach me how to bear the burden of sorrow without a groan on my part, and how to bear prosperity without making others groan; also, how to avoid waiting for the ultimate and inevitable end, and to beat a retreat of my own free will, when it seems proper to me to do so.

Quemadmodum omnium rerum, sic litterarum quoque intemperantia laboramus: non vitae sed scholae discimus.

That is why we give to children a proverb, or that which the Greeks call Chreia, to be learned by heart; that sort of thing can be comprehended by the young mind, which cannot as yet hold more. For a man, however, whose progress is definite, to chase after choice extracts and to prop his weakness by the best known and the briefest sayings and to depend upon his memory, is disgraceful; it is time for him to lean on himself. He should make such maxims and not memorize them. For it is disgraceful even for an old man, or one who has sighted old age, to have a note-book knowledge. "This is what Zeno said." But what have you yourself said? "This is the opinion of Cleanthes." But what is your own opinion? How long shall you march under another man's orders? Take command, and utter some word which posterity will remember. Put forth something from your own stock.