In the dim background of our mind we know meanwhile what we ought to be doing: getting up, dressing ourselves, answering the person who has spoken to us, trying to make the next step in our reasoning. But somehow we cannot start.

Intelligence is a fixed goal with variable means of achieving it.

A remarkable parallel, which I think has never been noticed, obtains between the facts of social evolution on the one hand, and of zological evolution as expounded by Mr. Darwin on the other.

The prescription is that the subject must be made to show new aspects of itself; to prompt new questions; in a word, to change. From an unchanging subject the attention inevitably wanders away.

If an unusual necessity forces us onward, a surprising thing occurs. The fatigue gets worse up to a certain point, when, gradually or suddenly, it passes away and we are fresher than before!

There can be no difference anywhere that does not make a difference somewhere.

Could the young but realize how soon they will become mere walking bundles of habits, they would give more heed to their conduct while in the plastic state.