It is necessary for the very existence of science that minds exist which do not allow that nature must satisfy some preconceived conditions.

The whole question of imagination in science is often misunderstood by people in other disciplines. ... They overlook the fact that whatever we are allowed to imagine in science must be consistent with everything else we know.

All theoretical chemistry is really physics; and all theoretical chemists know it.

Science is a process for learning about nature in which competing ideas about how the world works are measured against observations.

It is simple, therefore it is beautiful

[B]eyond poverty, beyond the point that the material needs are reasonably satisfied, only from within is peace.

A very great deal more truth can become known than can be proven.