"I have never seen the slightest scientific proof of the religious theories of the creation of the world, and I do not believe any such proof will be found."

"We should try to prevent the propagation of the unfit."

"There are no secrets to success. It is the result of preparation, hard work, and learning from failure."

"The telephone is an electrical toy."

"The greatest discovery of my life was the discovery of the value of hard work."