"The Negroes and Americans will hence never be capable of founding an orderly civil society for themselves."

"All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason."

"Space and time are not properties of things in themselves, but forms of our intuition."

"Experience without theory is blind, but theory without experience is mere intellectual play."

"The Chinese are a race of liars."