"Ignorance is the root and stem of every evil."

"The man who makes everything that leads to happiness, depends upon himself, and not upon other men, has adopted the very best plan for living happily. This is the man of moderation, the man of manly character and of wisdom."

"Necessity is the mother of invention."

"We are twice armed if we fight with faith."

"Rhetoric is the art of ruling the minds of men."

"Self-conquest is the greatest of victories."

"Will life be worth having, if that higher part of man be destroyed, which is improved by justice and depraved by injustice?"

"True friendship can exist only between equals."

"All I really know is the extent of my own ignorance."

"Music and rhythm find their way into the secret places of the soul."

"As there are misanthropists, or haters of men, there are also misologists, or haters of ideas, and both spring from the same cause, which is ignorance of the world."

"There is, in my view, the birth of society that each of us, far from being sufficient to itself, on the contrary need a large number of people."

"Our love for our children springs from the soul's greatest yearning for immortality."

"The worst type of man behaves as badly in his waking life as some men do in their dreams."

"No one punishes the evil-doer under the notion, or for the reason, that he has done wrong. Only the unreasonable fury of a beast acts in that way. But he who desires to inflict rational punishment does not retaliate for a past wrong, for that which is done cannot be undone, but he has regard to the future, and is desirous that the man who is punished, and he who sees him punished, may be deterred from doing wrong again."

"I thought to myself: I am wiser than this man; neither of us probably knows anything that is really good, but he thinks he has knowledge, when he has not, while I, having no knowledge, do not think I have.,."

"The only real ill-doing is the deprivation of knowledge."

"Life must be lived as play, playing certain games, making sacrifices, singing and dancing, and then a man will be able to propitiate the gods, and defend himself against his enemies, and win in the contest."

"No wealth can ever make a bad man at peace with himself."

"An empty vessel makes the loudest sound, so they that have the least wit are the greatest babblers."