If there is a small rocket on top of a big one, and if the big one is jettisoned and the small one is ignited, then their speeds are added.

The first rule of intelligent tinkering is to save all the parts.

In the United States, I am often addressed as a doctor. I should like to point out, however, that I am not such and shall never think of becoming one.

To err is human, but to really foul things up you need a computer.

A theory has only the alternative of being right or wrong. A model has a third possibility: it may be right, but irrelevant.

We’re one of the most highly regulated industries, and we have to pay attention to what government is doing.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

We have no right to assume that any physical laws exist, or if they have existed up to now, that they will continue to exist in a similar manner in the future.

The National Academy of Sciences would be unable to give a unanimous decision if asked whether the sun would rise tomorrow.

Everything in life is speaking in spite of it’s apparent silence.

Ego is the immediate dictate of human consciousness.

The words that enlighten the soul are more precious than jewels.

Whence come I and whither go I? That is the great unfathomable question, the same for every one of us. Science has no answer to it.

I have seen all souls as my soul, and realized my soul as the soul of all.

Anybody who has been seriously engaged in scientific work of any kind realizes that over the entrance to the gates of the temple of science are written the words: Ye must have faith. It is...

Our educational system is like an automobile which has strong rear lights, brightly illuminating the past. But looking forward things are barely discernible.

All matter originates and exists only by virtue of a force… We must assume behind this force the existence of a conscious and intelligent Mind. This Mind is the matrix of all matter.

The rockets… can be built so powerfully that they could be capable of carrying a man aloft.

A scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die and a new generation grows up that is familiar with it.

To make available for life every place where life is possible. To make inhabitable all worlds as yet uninhabitable, and all life purposeful.

Sometimes a scream is better than a thesis.

I refrained from writing another one, thinking to myself: Never mind, I will prove that I am able to become a greater scientist than some of you, even without the title of doctor.

I see harm reduction as a way of engaging people as part of that path to recovery.