No man can be a good teacher unless he has feelings of warm affection toward his pupils and a genuine desire to impart to them what he believes to be of value.

Science is at no moment quite right, but it is seldom quite wrong, and has, as a rule, a better chance of being right than the theories of the unscientific. It is, therefore, rational to accept it hypothetically.

Opinions which justify cruelty are inspired by cruel impulses.

We must be sceptical even of our scepticism.

All serious innovation is only rendered possible by some accident enabling unpopular persons to survive.

The more things a man is interested in, the more opportunities of happiness he has and the less he is at the mercy of fate, since if he loses one thing he can fall back upon another.

It seems to be the fate of idealists to obtain what they have struggled for in a form which destroys their ideals.