Those who have the privilege to know have the duty to act.

It was the experience of mystery - even if mixed with fear - that engendered religion.

Science has brought forth this danger, but the real problem is in the minds and hearts of men.

[Kepler] had to realize clearly that logical-mathematical theoretizing, no matter how lucid, could not guarantee truth by itself; that the most beautiful logical theory means nothing in natural science without comparison with the exactest experience. Without this philosophic attitude, his work would not have been possible.

I'm more interested in the future than in the past, because the future is where I intend to live.

We still do not know one thousandth of one percent of what nature has revealed to us.

It is my inner conviction that the development of science seeks in the main to satisfy the longing for pure knowledge.