"We are not here concerned with the first origin of life."

"I am not apt to follow blindly the lead of other men."

"The fact that I can't remember anything from the first three years of my life is no proof that I wasn't an embryo then."

"I am almost convinced (quite contrary to opinion I started with) that species are not (it is like confessing a murder) immutable."

"The more I see of the world, the more I am convinced of the fact that it is full of wonders."