Thought is the wind, knowledge the sail.

The ultimate tendency of civilization is toward barbarism.

To those whose god is honour, disgrace alone is sin.

The virtue of Paganism was strength: the virtue of Christianity is obedience.

During the earliest stages of thought, accommodation remains on the surface of physical as well as social experience.

No theory is good unless it permits, not rest, but the greatest work. No theory is good except on condition that one use it to go on beyond.

The apple cannot be stuck back on the Tree of Knowledge; once we begin to see, we are doomed and challenged to seek the strength to see more, not less.