The happiness which belongs to man, is that state in which he enjoys as many of the good things, and suffers as few of the evils incident to human na… - Epicurus

τὸ φρικωδέστατον οὖν τῶν κακῶν ὁ θάνατος οὐθὲν πρὸς ἡμᾶς͵ ἐπειδήπερ ὅταν μὲν ἡμεῖς ὦμεν͵ ὁ θάνατος οὐ πάρεστιν͵ ὅταν δὲ ὁ θάνατος παρῇ͵ τόθ΄ ἡμεῖς οὐκ ἐσμέν.

It is impossible for a man who secretly violates the terms of the agreement not to harm or be harmed to feel confident that he will remain undiscovered, even if he has already escaped ten thousand times; for until his death he is never sure that he will not be detected. (35)

Let no one be slow to seek wisdom when he is young nor weary in the search of it when he has grown old. For no age is too early or too late for the health of the soul. And to say that the season for studying philosophy has not yet come, or that it is past and gone, is like saying that the season for happiness is not yet or that it is now no more. Therefore, both old and young alike ought to seek wisdom, the former in order that, as age comes over him, he may be young in good things because of the grace of what has been, and the latter in order that, while he is young, he may at the same time be old, because he has no fear of the things which are to come. So we must exercise ourselves in the things which bring happiness, since, if that be present, we have everything, and, if that be absent, all our actions are directed towards attaining it.