What men of science want is only a fair day's wages for more than a fair day's work.

I doubt the fact, to begin with, but if it be so even, what is this but in grand words asking me to believe a thing because I like it.

We live in a world which is full of misery and ignorance, and the plain duty of each and all of us is to try to make the little corner he can influence somewhat less miserable and somewhat less ignorant than it was before he entered.

I would rather be the offspring of two apes than be a man and afraid to face the truth.

It is better to read a little and thoroughly than cram a crude undigested mass into my head, though it be great in quantity.

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

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.