Technological progress is like an axe in the hands of a pathological criminal.

The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty.  

I have retired, but if there's anything that would kill me it is to wake up in the morning not knowing what to do. 

Never let your ego get so close to your position that when your position goes, your ego go with it.

No one wants to die. Even people who want to go to heaven don't want to die to get there. And yet death is the destination we all share. No one has ever escaped it. And that is as it should be, because Death is very likely the single best invention of Life. It is Life's change agent. It clears out the old to make way for the new.

Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties.

My best friend is the man who in wishing me well wishes it for my sake.

It is astonishing what an effort it seems to be for many people to put their brains definitely and systematically to work.

Whenever I go on a ride, I'm always thinking of what's wrong with the thing and how it can be improved.

The sky, horizon, rainbow, and mirage are all illusions. The universe is full of illusions.

A small body of determined spirits fired by an unquenchable faith in their mission can alter the course of history.

The most perfect political community is one in which the middle class is in control, and outnumbers both of the other classes.