If I had only known, I would have been a locksmith.

For me the Jewish religion like all others is an incarnation of the most childish superstitions, and the Jewish people to whom I gladly belong and with whose mentality I have a deep affinity have no different quality for me than all other people. As far as my experience goes, they are no better than other human groups, although they are protected from the worst cancers by a lack of power. Otherwise I cannot see anything chosen about them.

If the bees disappear, man would have only four years of life left.

Out of the multitude of our sense experiences we take, mentally and arbitrarily, certain repeatedly occurring complexes of sense impression (partly in conjunction with sense impressions which are interpreted as signs for sense experiences of others), and we attribute to them a meaning the meaning of the bodily object.

The really valuable method of thought to arrive at a logically coherent system is intuition.

The important thing is to never stop questioning. Never lose a holy curiosity.

Something deeply hidden had to be behind things.