"The highest activity a human being can attain is learning for understanding, because to understand is to be free."

"It is impossible for a man to be affected by any emotion unless he imagines something which excludes the existence of an external cause of that emotion."

"The human mind cannot be absolutely destroyed with the body, but something of it remains which is eternal."

"A free man thinks of death least of all things; and his wisdom is a meditation not of death but of life."

"The mind, the more it understands, the more it loves."