Self-denial is the best riches.

Plato once wanted to punish one of his slaves and asked his nephew to do the actual whipping for he himself did not own his anger.

Fortune can take away riches, but not courage.

There is no greater punishment of wickedness that that it is dissatisfied with itself and its deeds.

The anger of those in authority is always weighty.

The time will come when diligent research over periods will bring to light things which now lie hidden...Many discoveries are reserved for ages still to come, when memories of us will have been effaced. Our universe is a sorry little affair unless it has something for every age to investigate. nature does not reveal her mysteries once and for all.

You should rather suppose that those are involved in worthwhile duties who wish to have daily as their closest friends Zeno, Pythagoras, Democritus and all the other high priests of liberal studies, and Aristotle and Theophrastus. None of these will be too busy to see you, none of these will not send his visitor away happier and more devoted to himself, none of these will allow anyone to depart empty-handed. They are at home to all mortals by night and by day.