The reason men oppose progress is not that they hate progress, but that they love inertia.
The heroic man does not pose; he leaves that for the man who wishes to be thought heroic.
Constant effort and frequent mistakes are the stepping stones to genius.
Your neighbor is the man who needs you.
The greatest mistake a person can make is to be afraid of making one.
Optimism is a kind of heart stimulant - the digitalis of failure.