"The misuse of language induces evil in the soul."

"To move the world we must move ourselves."

"I shall never cease from the practice and teaching of philosophy, exhorting anyone whom I meet after my manner, and convincing him, saying: O my friend, why do you who are a citizen of the great and mighty and wise city of Athens, care so much about laying up the greatest amount of money and honor and reputation, and so little about wisdom and truth and the greatest improvement of the soul, which you never regard or heed at all? Are you not ashamed of this?"

"We cannot live better than in seeking to become better."

"To be is to do."

"Employ your time in improving yourself by other men's writings so that you shall come easily by what others have labored hard for."

"We cannot live better than in seeking to become better."

"Understanding a question is half an answer."

"Human nature will not easily find a better helper than Eros"

"A system of morality which is based on relative emotional values is a mere illusion, a thoroughly vulgar conception which has nothing sound in it and nothing true."

"Virtue does not come from wealth, but ... wealth, and every other good thing which men have comes from virtue."

"Children nowadays are tyrants. They contradict their parents, gobble their food, and tyrannize their teachers."

"All I know is that I know nothing."

"The only good is knowledge and the only evil is ignorance."

"We cannot live better than in seeking to become better."

"If all our misfortunes were laid in one common heap whence everyone must take an equal portion, most people would be content to take their own and depart."

"Be nicer than necessary to everyone you meet. Everyone is fighting some kind of battle."

"How many things can I do without?"

"As to marriage or celibacy, let a man take which course he will, he will be sure to repent."

"Every action has its pleasures and its price."