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

"This world is indeed a living being endowed with a soul and intelligence ... a single visible living entity containing all other living entities, which by their nature are all related."

"Without any one teaching him he will recover his knowledge for himself, if he is only asked questions."

"If people despise money when young, but grow to love it more and more as they grow older and no longer devote themselves to excellence as the best guardian, the power of reasoned, educated speech, leaves them."

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

"The soul of him who has education is whole and perfect and escapes the worst disease, but, if a man's education be neglected, he walks lamely through life and returns good for nothing to the world below."

"I must distinguish between that which always is and never becomes and which is apprehended by reason and reflection, and that which always becomes and never is and is conceived by opinion with the help of sense."

"It seems to me that many fall into it even against their will, and fancy they are discussing, when they are merely debating, because they cannot distinguish the meanings of a term, in their investigation of any question, but carry on their opposition to what is stated, by attacking the mere words, employing the art of debate, and not that of philosophical discussion."

"Beauty lies in the eyes of the beholder."

"Mankind will never see an end of trouble until lovers of wisdom come to hold political power, or the holders of power become lovers of wisdom."