If one knows only what one is told, one does not know enough to be able to arrive at a well-balanced decision.

We turned the switch, saw the flashes, watched for ten minutes, then switched everything off and went home. That night I knew the world was headed for sorrow.

I have been asked whether I would agree that the tragedy of the scientist is that he is able to bring about great advances in our knowledge, which mankind may then proceed to use for purposes of destruction. My answer is that this is not the tragedy of the scientist; it is the tragedy of mankind.

Those individuals who give moral considerations a much greater weight than considerations of expediency represent a comparatively small minority, five percent of the people perhaps. But, In spite of their numerical inferiority, they play a major role in our society because theirs is the voice of the conscience of society.

If you want to succeed in the world, you don't have to be much cleverer than other people. You just have to be one day earlier.

Do not destroy what you cannot create.

Pronouncement of experts to the effect that something cannot be done has always irritated me.