Over the whole earth- this infinitely small globe that possesses all we know of sunshine and bird song- an unfamiliar blight is creeping: man- man, who has become at last a planetary disease and who would, if his technology yet permitted, pass this infection to another star.

It is frequently the tragedy of the great artist, as it is of the great scientist, that he frightens the ordinary man.

It has been said repeatedly that one can never, try as he will, get around to the front of the universe. Man is destined to see only its far side, to realize nature only in retreat.

It was the failures who had always won, but by the time they won they had come to be called successes.

Each man deciphers from the ancient alphabets of nature only those secrets that his own deeps possess the power to endow with meaning.

We cannot pluck a flower witout disturbing a star.

We think we learn from teachers, and we sometimes do. But the teachers are not always to be found in school or in great laboratories. Sometimes what we learn depends upon our own powers of insight.