James Clerk Maxwell's [work is the] most profound and the most fruitful.

I don't try to imagine a personal God; it suffices to stand in awe at the structure of the world, insofar as it allows our inadequate senses to appreciate it.

One must take what nature gives as one finds it.

How can any educated person stay away from the Greeks? I have always been far more interested in them than in science.

My deep religiosity [...] found an abrupt ending at the age of twelve, through the reading of popular scientific books.

Teaching should be such that what is offered is perceived as a valuable gift and not as a hard duty.

The most difficult part about understanding something is that we understand it all.