The mind is everything. What you think you become.

A man who doesn't think differently from his time and environment can't grow beyond his time and environment.

There is a subtle danger in a man thinking that he is "fixed" for life. It indicates that the next jolt of the wheel of progress is going to fling him off.

The smartest people are constantly revising their understanding, reconsidering a problem they thought they'd already solved. They're open to new points of view, new information, new ideas, contradictions, and challenges to their own way of thinking.

All things are ready, if our mind be so.

If you travel the earth, you will find it is largely divided into two classes of people-people who say 'I wonder why such and such is not done" and people who say "Now who is going to prevent me from doing that thing?"