One can only continue to expect to be read if one omits everything that is unimportant.

[Mystery] is the fundamental emotion that stands at the cradle of true art and true science.

A man has to work so hard so that something of his personality stays alive. A tomcat has it so easy, he has only to spray and his presence is there for years on rainy days.

If you cannot explain it simply, you do not understand it enough.

The great need to grasp principles had caused me to spend most of my time on fruitless persuits.

Past is dead Future is uncertain; Present is all you have, So eat, drink and live merry.

We shall require a substantially new manner of thinking if mankind is to survive.