"Heaven is to me as definite a world as Europe or the United States."

"The black man is a child, and must be treated as such."

"You see, but you do not observe. The distinction is clear."

"I have no doubt that there are other planets inhabited by intelligent beings."

"A man should keep his little brain attic stocked with all the furniture that he is likely to use, and the rest he can put away in the lumber-room of his library, where he can get it if he wants it."