Action is coarsened thought; thought becomes concrete, obscure, and unconscious.
For purposes of action nothing is more useful than narrowness of thought combined with energy of will.
Conquering any difficulty always gives one a secret joy, for it means pushing back a boundary-line and adding to one's liberty.
The man who has no inner-life is a slave to his surroundings.
Self-interest is but the survival of the animal in us. Humanity only begins for man with self-surrender.
Uncertainty is the refuge of hope.