You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat.

Many of the things you can count, don't count. Many of the things you can't count, really count.

E=mc2. Energy equals mass times the speed of light squared

The man who regards his own life and that of his fellow-creatures as meaningless is not merely unfortunate but almost disqualified for life.

The music of Mozart is of such purity and beauty that one feels he merely found it - that it has always existed as part of the inner beauty of the universe waiting to be revealed.

It is every man's obligation to put back into the world at least the equivalent of what he takes out of it.

Everything that the human race has done and thought is concerned with the satisfaction of deeply felt needs and the assuagement of pain. One has to keep this constantly in mind if one wishes to understand spiritual movements and their development. Feeling and longing are the motive force behind all human endeavor and human creation, in however exalted a guise the latter may present themselves to us.