“Liberty of thought is the life of the soul.”

“All men are by nature free; you have therefore an undoubted liberty to depart whenever you please, but will have many and great difficulties to encounter in passing the frontiers.”

“Reading nurtures the soul, and an enlightened friend brings it solace. ”

“Four thousand volumes of metaphysics will not teach us what the soul is.”

“my soul is the mirror of the universe, and my body is its frame”

“I know this love, that sovereign of hearts, that soul of our souls; yet it never cost me more than a kiss and twenty kicks on the backside. How could this beautiful cause produce in you an effect so abominable.”

“Alas...I too have known love, that ruler of hearts, that soul of our soul: it's never brought me anything except one kiss and twenty kicks in the rump. How could such a beautiful cause produce such an abominable effect on you?”