That is the way to learn the most, that when you are doing something with such enjoyment that you don't notice that the time passes.

I'd rather be an optimist and a fool than a pessimist and right.

To have a better life we must keep choosing how we are living.

The problems that exist in this world can not be solved by the level of thinking that created them.

Today we must abandon competition and secure cooperation. This must be the central fact in all our considerations of international affairs; otherwise we face certain disaster. Past thinking and methods did not prevent world wars. Future thinking must prevent wars...The stakes are immense, the task colossal the time is short. But we may hope- we must hope- that man's own creation, man's own genius, will not destroy him.

The comprehensibility of the world seems to me a wonder or eternal secret. Here lies the sense of wonder which increases even more with the development of our knowledge.

Thinking like we (always) have is what got us where we are. It is not going to get us where we are going.