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.

To spend life for something which outlasts it.

Nothing is so fatiguing as the eternal hanging on of an uncompleted task.

A sense of humor is just common sense dancing.

The greatest weapon we have to combat stress is the ability to choose our thoughts.

Despair lames most people, but it wakes others fully up.

Beyond the very extreme of fatigue and distress, we may find amounts of ease and power we never dreamed ourselves to own; sources of strength never taxed at all because we never push through the obstruction