The world has enough for every man's need, but not for one man's greed.
The first wealth is health.
For most people it takes a long time to become young.
Money and laughter can turn old age into youth.
Life is like long-distance running. Only if you plan clever use of your strength can you make the course and still have reserves at the end.
It is more difficult to destroy a prejudice than an atom.
I prefer brave opponents to opportunistic friends.
I'm astounded by people who want to "know" the universe. It's hard enough to find your way around Chinatown.
What we know is a drop, what we don't know, an ocean.
You can't have everything. Where would you put it?