Our true mentor in life is science.

Science is the most reliable guide for civilization, for life, for success in the world. Searching a guide other than the science is meaning carelessness, ignorance and heresy.

Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult, at least I have found it so, than constantly to bear this conclusion in mind.

You don't get another chance. Life is no Nintendo game.

What is life but a series of inspired follies? The difficulty is to find them to do. Never lose a chance: it doesn't come every day.

If numerous species, belonging to the same genera or families, have really started into life all at once, the fact would be fatal to the theory of descent with slow modification through natural selection.