The world of learning is so broad, and the human soul is so limited in power! We reach forth and strain every nerve, but we seize only a bit of the curtain that hides the infinite from us."

"We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry."

Every formula which expresses a law of nature is a hymn of praise to God.

"When we are chafed and fretted by small cares, a look at the stars will show us the littleness of our own interests."

"People have to learn sometimes not only how much the heart, but how much the head, can bear."