Man is imperfect. The reality he creates is always endangered by man.
The content of physics is the concern of physicists, its effect the concern of all men.
It is bad luck for world history that of all people the Russians adopted Communism, because they are totally unfit for it.
It is inhuman to continue a war which could easily be ended
Nothing that has been thought can ever be taken back
You can't take back an act you were able to think.