Man alone of all the creatures of earth can change his own pattern. Man alone is the architect of his own destiny.

Men habitually use only a small part of the power which they actually possess.

Compared to what we ought to be, we are half awake.

In order to disprove the assertion that all crows are black, one white crow is sufficient.

Lives based on having are less free than lives based either on doing or being.

The strenuous life tastes better

The function of ignoring, of inattention, is as vital a factor in mental progress as the function of attention itself.