"I have gradually come to disbelieve in Christianity as a divine revelation."

"I have no great quickness of apprehension or wit which is so remarkable in some clever men, but I have a fair share of invention and of common sense."

"If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin."

"I have always felt a strong feeling of gratitude to those who have helped me in my work."

"If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down."