Our firm conviction that ours is a just cause and that we must find a peaceful way to attain our goals gave us the strength and the awareness of the limits beyond which we must not go. ↗
It can hardly be denied that such a demand quite arbitrarily limits the facts which are to be admitted as possible causes of the events which occur in the real world. ↗
The progress of the natural sciences in modern times has of course so much exceeded all expectations that any suggestion that there may be some limits to it is bound to arouse suspicion. ↗