The only ethical principle which has made science possible is that the truth shall be told all the time. If we do not penalize false statements made in error, we open up the way for false statements by intention. And a false statement of fact, made deliberately, is the most serious crime a scientist can commit.

A woman fit to be a man's wife is too good to be his servant.

Nothing is more vulgar than a careful avoidance of beginning a letter with the first person singular.

Passion's a good, stupid horse that will pull the plough six days a week if you give him the run of his heels on Sundays. But love's a nervous, awkward, over-mastering brute; if you can't rein him, it's best to have no truck with him.

What we ask is to be human individuals, however peculiar and unexpected. It is no good saying: "You are a little girl and therefore you ought to like dolls"; if the answer is, "But I don't," there is no more to be said.

[Did you] ever know a sincere emotion to express itself in a subordinate clause?

That there is a secret itself is a secret.