Wherever there are beginners and experts, old and young, there is some kind of learning going on, some kind of teaching. We are all pupils and we are all teachers.

The wise teacher knows that 55 minutes of work plus 5 minutes laughter are worth twice as much as 60 minutes of unvaried work.

If you do not actually like boys and girls, or young men and young women, give up teaching.

The chief aim of education is to show you, after you make a livelihood, how to enjoy living; and you can live longest and best and most rewardingly by attaining and preserving the happiness of learning.

The art of invective resembles the art of boxing. Very few fights are won with the straight left. It is too obvious, and it can betoo easily countered. The best punches, like the best pieces of invective in this style, are either short-arm jabs, unexpectedly rapid and deadly; or else one-two blows, where you prepare your opponent with the first hit, and then, as his face comes forward, connect with your other fist: one, two. Both are effective; but they can be administered only by a real artist, with a real wish to knock his enemy out.

A teacher must believe in the value and interest of his subject as a doctor believes in health.

The real duty of man is not to extend his power or multiply his wealth beyond his needs, but to enrich and enjoy his imperishable possession: his soul.