The entire routine of our memorized acquisitions, for example, is a consequence of nothing but the Law of Contiguity. The words of a poem, the formulas of trigonometry, the facts of history, the properties of material things, are all known to us as definite systems or groups of objects which cohere in an order fixed by innumerable iterations, and of which any one part reminds us of the others.

The soul is stronger than its surroundings.

There is but one unconditional commandment ... to bring about the very largest total universe of good which we can see.

If there is aught of good in the style, it is the result of ceaseless toil in rewriting. Everything comes out wrong with me at first; but when once objectified in a crude shape, I can torture and poke and scrape and pat it till it offends me no more.

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.

No reception without reaction, no impression without correlative expression, -this is the great maxim which the teacher ought never to forget.

The love of life, at any and every level of development, is the religious impulse.