Of moral purpose I see no trace in Nature. That is an article of exclusively human manufacture and very much to our credit.

Teach a man to read and write, and you have put into his hands the great keys of the wisdom-box.

Matter and force are the two names of the one artist who fashions the living as well as the lifeless.

People may talk about intellectual teaching, but what we principally want is the moral teaching.

If every man possessed everything he wanted, and no one had the power to interfere with such possession; or if no man desired thatwhich could damage his fellow-man, justice would have no part to play in the universe.

A man who speaks out honestly and fearlessly that which he knows, and that which he believes, will always enlist the good will and the respect, however much he may fail in winning the assent, of his fellow men.

Common sense is science exactly in so far as it fulfills the ideal of common sense; that is, sees facts as they are, or at any rate, without the distortion of prejudice, and reasons from them in accordance with the dictates of sound judgment. And science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.