Our modern wars make many unhappy while they last and none happy when they are over.

All theory, dear friend, is gray, but the golden tree of life springs ever green.

If you must tell me your opinions, tell me what you believe in. I have plenty of doubts of my own.

Quite often, as life goes on, when we feel completely secure as we go on our way, we suddenly notice that we are trapped in error, that we have allowed ourselves to be taken in by individuals, by objects, have dreamt up an affinity with them which immediately vanishes before our waking eye; and yet we cannot tear ourselves away, held fast by some power that seems incomprehensible to us. Sometimes, however, we become fully aware and realize that error as well as truth can move and spur us on to action.

The person of analytic or critical intellect finds something ridiculous in everything. The person of synthetic or constructive intellect, in almost nothing.

There is nothing more frightful than for a teacher to know only what his scholars are intended to know.

To have more, you must first be more.