The biggest risk is not taking any risk. In a world that is changing quickly, the only strategy that is guaranteed to fail is not taking risks.
The best way to help people is not to do things for them, but to help them do things for themselves.
The most beautiful as well as the most ugly inclinations of man are not part of a fixed biologically given nature, but result from the social process which creates man.
"Every discovery in science is a step closer to understanding our place in the cosmos."