"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."

"Freedom is absolutely necessary for the progress in science and the liberal arts."

"Men are deceived if they think themselves free, a belief that consists only in this, that they are conscious of their actions and ignorant of the causes by which they are determined."

"The intellectual love of God is the very love of God with which God loves himself, not insofar as he is infinite, but insofar as he can be explicated through the human mind's essence, considered under…"

"All things excellent are as difficult as they are rare."