In a sense, knowledge shrinks as wisdom grows, for details are swallowed up in principles. The details for knowledge which are important, will be picked up ad hoc in each avocation of life, but the habit of the active utilization of well-understood principles is the final possession of WISDOM.

An open mind is all very well in its way, but it ought not to be so open that there is no keeping anything in or out of it.

Whenever a text-book is written of real educational worth, you may be quite certain that some reviewer will say that it will be difficult to teach from it. Of course it will be difficult to teach from it. It it were easy, the book ought to be burned.

The science of pure mathematics, in its modern developments, may claim to be the most original creation of the human spirit.

Religion is what a person does in his solitariness.

Religion is what the individual does with his own solitariness.

But harmony is limitation. Thus rightness of limitation is essential for growth of reality. Unlimited possibility and abstract creativity can procure nothing.