Nothing is so fatiguing as the eternal hanging on of an uncompleted task.

I believe there is no source of deception in the investigation of nature which can compare with a fixed belief that certain kinds of phenomena are IMPOSSIBLE.

Nature in her unfathomable designs had mixed us of clay and flame, of brain and mind, that the two things hang indubitably together and determine each other's being but how or why, no mortal may ever know.

The community stagnates without the impulse of the individual. The impulse dies away without the sympathy of the community.

The faculty of voluntarily bringing back a wandering attention, over and over again, is the very root of judgment, character, and will... An education which should improve this faculty would be the education par excellence.

Despair lames most people, but it wakes others fully up.

Habit is a second nature, or rather, it is 'ten times nature'.