It would be better if you began to teach others only after you yourself have learned something.

A forced faithfulness is a bitter fruit for all concerned.

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

One must not attempt to justify them, but rather to sense their nature simply and clearly.

There comes a point in your life when you need to stop reading other people's books and write your own.

An attempt at visualizing the Fourth Dimension: Take a point, stretch it into a line, curl it into a circle, twist it into a sphere, and punch through the sphere.

Concern for man himself must always constitute the chief objective of all technological effort