"I have said that the soul is a little world where distinct ideas represent God and confused ones represent the universe."

"The actual world is the most beautiful, because it contains the greatest variety with the greatest order."

"I am not one of those people whose minds are so limited that they are unable to conceive of more than one kind of substance."

"The words 'Here you can find perfect peace' can be written only over the gates of a cemetery."

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