Only as you do know yourself can your brain serve you as a sharp and efficient tool. Know your own failings, passions, and prejudices so you can separate them from what you see.

I made my money by selling too soon.

Approach each new problem not with a view of finding what you hope will be there, but to get the truth, the realities that must be grappled with. You may not like what you find. In that case you are entitled to try to change it. But do not deceive yourself as to what you do find to be the facts of the situation.

Information cannot serve as an effective substitute for thinking.

Millions saw the apple fall but Newton was the one who asked why.

Unless each man produces more than he receives, increases his output, there will be less for him than all the others.

Whatever failures I have known, whatever errors I have committed, whatever follies I have witnessed in private and public life have been the consequence of action without thought.