Aeschylus

“A prosperous fool is a grievous burden.”

“Every ruler is harsh whose law is new.”

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

“It is a profitable thing, if one is wise, to seem foolish.”

“It is always in season for old men to learn.”

“Married love between man and woman is bigger than oaths guarded by right of nature.”

“Memory is the mother of all wisdom.”

“The reward of suffering is experience.”

“The wisest of the wise may err.”

“There is no pain so great as the memory of joy in present grief.”

“There is no sickness worse for me than words that to be kind must lie.”

“Time as he grows old teaches all things.”

“Time brings all things to pass.”

“Words are the physicians of the mind diseased.” [Prometheus Bound]