Aeschylus

Happiness is a choice that requires effort at times. ”

It is good even for old men to learn wisdom. ”

He who learns must suffer. And even in our sleep pain that cannot forget falls drop by drop upon the heart, and in our own despair, against our will, comes wisdom to us by the awful grace of God. ”

Wisdom comes alone through suffering. ”

Memory is the mother of all wisdom. ”

For somehow this disease inheres in tyranny, never to trust one's friends. ”

In every tyrant's heart there springs in the end this poison, that he cannot trust a friend. ”

What exists outside is a man's concern; let no woman give advice; and do no mischief within doors. ”

It is easy when we are in prosperity to give advice to the afflicted. ”

It is an easy thing for one whose foot is on the outside of calamity to give advice and to rebuke the sufferer. ”