Science must constantly be reminded that her purposes are not the only purposes and that the order of uniform causation which she has use for, and is therefore right in postulating, may be enveloped in a wider order, on which she has no claim at all.

Your hopes, dreams and aspirations are legitimate. They are trying to take you airborne, above the clouds, above the storms, if you only let them.

No one sees further into a generalization than his own knowledge of detail extends.

How to gain, how to keep, how to recover happiness is in fact for most men at all times the secret motive of all they do, and of all they are willing to endure.

Mankind's common instinct for reality has always held the world to be essentially a theatre for heroism.

Plasticity, then, in the wide sense of the word, means the possession of a structure weak enough to yield to an influence, but strong enough not to yield all at once. Each relatively stable phase of equilibrium in such a structure is marked by what we may call a new set of habits.

We never fully grasp the import of any true statement until we have a clear notion of what the opposite untrue statement would be.