Plato

"To be curious about that which is not one's concern while still in ignorance of oneself is absurd."

"Apply yourself both now and in the next life. Without effort, you cannot be prosperous. Though the land be good, you cannot have an abundant crop without cultivation."

"Learning is by nature, curiosity."

"Wealth and poverty; the one is the parent of luxury and indolence, and the other of meanness and viciousness, and both of discontent."

"When men speak ill of thee, live so as nobody may believe them."

"Human behaviour flows from three main sources: desire, emotion, and knowledge."

"A good decision is based on knowledge and not on numbers."

"Honesty is for the most part less profitable than dishonesty"

"Necessity, is the mother of our invention."