The highest forms of understanding we can achieve are laughter and human compassion.

As usual, nature's imagination far surpasses our own, as we have seen from the other theories which are subtle and deep.

I don't have to be good because they think I'm going to be good.

To not know math is a severe limitation to understanding the world.

There is nothing in biology yet found that indicates the inevitability of death. This suggests to me that it is not at all inevitable and that it is only a matter of time before biologists discover what it is that is causing us the trouble.

A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.

I wonder why. I wonder why. I wonder why I wonder.