The ideas gained by men before they are twenty-five are practically the only ideas they shall have in their lives.

We forget that every good that is worth possessing must be paid for in strokes of daily effort.

I am done with great things and big things, great institutions and big success, and I am for those tiny, invisible molecular moral forces that work from individual to individual, creeping through the crannies of the world like so many rootlets, or like the capillary oozing of water, yet which if you give them time, will rend the hardest monuments of man's pride.

If it works, it's true.

First... a new theory is attacked as absurd; then it is admitted to be true, but obvious and insignificant; finally it is seen to be so important that its adversaries claim that they themselves discovered it.

Deepest principle of human nature is to be appreciated.

No decision is, in itself, a decision.