"It is impossible for someone to dispel his fears about the most important matters if he does not understand the nature of the universe but still gives some credence to myths. So that without the study…"

"Let no one when young delay to study philosophy, nor when old grow weary of studying it. For no one is either too early or too late for the health of the soul."

"The greatest good is to be free from pain and mental disturbance."

"It is not possible to dispel the fear of the most important things unless one understands the whole nature of the universe."

"I have never wished to cater to the crowd; for what I know they do not approve, and what they approve I do not know."