“Does the harmony the human intelligence thinks it discovers in nature exist outside of this intelligence? No, beyond doubt, a reality completely independent of the mind which conceives it, sees or feels it, is an impossibility.”

“I was completely astonished by the beauty of nature. Our eyes see just a small fraction of the light in the world. It is a trick to make a colored world, which does not exist outside of human beings.”

“Denying the existence of God the Creator is like an artificial intelligent machine doubting the existence of human inventors.”

“That is the most stupid thing yet. I tell you that I could despair of human intelligence when I see what can exist in men’s minds.”

“People of limited intelligence are fond of talking about "these days," imagining that they have discovered and appraised the peculiarities of "these days" and that human nature changes with the times.”

“The true knowledge or science which exists nowhere but in the mind itself, has no other entity at all besides intelligibility; and therefore whatsoever is clearly intelligible, is absolutely true.”

“The public, therefore, among a democratic people, has a singular power, which aristocratic nations cannot conceive; for it does not persuade others to its beliefs, but it imposes them and makes them permeate the thinking of everyone by a sort of enormous pressure of the mind of all upon the individual intelligence.”

“The basic stimulus to the intelligence is doubt, a feeling that the meaning of an experience is not self-evident.”

“Now if you see that it is inconceivable that anything should exist, it is evident that at least one inconceivable fact is there. That is to say, that which exists is not limited to the conceivable. Since the inconceivable is there, it is impossible to set any limit to the quantity of inconceivableness which may be present in the situation. Now were the existence of anything consistently to remind you of the fact of inconceivability, since it is impossible to live without interacting with a large number of existing things, it would be impossible for you to feel in the same way about the conceivable.”

“There does not exist a man sufficiently intelligent never to be tiresome.”