Don't hesitate to be as revolutionary as science. Don't hesitate to be as reactionary as the multiplication table.

Two-thirds of all preachers, doctors and lawyers are hanging on to the coat tails of progress, shouting, whoa! while a good many of the rest are busy strewing banana peels along the line of march.

I often say that research is a way of finding out what you are going to do when you can't keep on doing what you are doing now.

[T]he small is great, the great is small; all is in equilibrium in necessity.

Leaves die, but trees do not. They only undress.

I knew when I met you an adventure was going to happen.

There is a realm of time where the goal is not to have but to be, not to own but to give, not to control but to share, not to subdue but to be in accord. Life goes wrong when the control of space, the acquisition of things of space, becomes our sole concern.

Technical civilization is man's conquest of space. It is a triumph frequently achieved by sacrificing an essential ingredient of existence, namely, time. In technical civilization, we expend time to gain space. To enhance our power in the world of space is our main objective. Yet to have more does not mean to be more. The power we attain in the world of space terminates abruptly at the borderline of time. But time is the heart of existence.

Time and space are interrelated. To overlook either of them is to be partially blind. What we plead against is man's unconditional surrender to space, his enslavement to things. We must not forget that it is not a thing that lends significance to a moment; it is the moment that lends significance to things.

We must not forget that it is not a thing that lends significance to a moment; it is the moment that lends significance to things.

To be a Jew is to affirm the world without being enslaved to it; to be a part of civilization and to go beyond it; to conquer space and to sanctify time. Judaism is the art of surpassing civilization, sanctification of time, sanctification of history. Civilization is on trial. Its future will depend upon how much of the Sabbath will penetrate its spirit.

There is a realm of time where the goal is not to have but to be, not to own but to give, not to control but to share, not to subdue but to be in accord. Life goes wrong when the control of space, the acquisition of things of space, becomes our sole concern.