A book or a letter may institute a more intimate association between human beings separated thousands of miles from each other than exists between dwellers under the same roof.

How can the child learn to be a free and responsible citizen when the teacher is bound?

Philosophy recovers itself when it ceases to be a device for dealing with the problems of philosophers and becomes a method, cultivated by philosophers, for dealing with the problems of men.

It requires troublesome work to undertake the alteration of old beliefs.

One can think effectively only when one is willing to endure suspense and to undergo the trouble of searching.

a problem well put is half solved.

If the eyes are open and there is light, seeing occurs; the stimulus is but a condition of the fulfillment of the proper function of the organ, not an outside interruption. To some extent, then, all direction or control is a guiding of activity to its own end; it is an assistance in doing fully what some organ is already tending to do.