"The doctrine that the world is governed by perfection was introduced to exclude the arbitrary will of God."

"To love is to be delighted by the happiness of another."

"For I hold that it is only when we can prove everything we assert that we understand perfectly the thing under consideration."

"The soul is the mirror of an indestructible universe."

"If you could blow the brain up to the size of a mill and walk about inside, you would not find consciousness."