Common sense is that layer of prejudices which we acquire before we are sixteen.

Scientists investigate that which already is; Engineers create that which has never been.

If I am right the Germans will say I was a German, and the French will say I was a Jew; If I am wrong the Germans will say I was a Jew and the French will say I was a German.

The most beautiful gift of nature is that it gives one pleasure to look around and try to comprehend what we see.

If one asks the whence derives the authority of fundamental ends, since they cannot be stated and justified merely by reason, one can only answer: they exist in a healthy society as powerful traditions, which act upon the conduct and aspirations and judgments of the individuals; they are there, that is, as something living, without its being necessary to find justification for their existence.

The Universe is a friendly place.

The right to search for truth implies also a duty.