Three Rules of Work: Out of clutter find simplicity. From discord find harmony. In the middle of difficulty lies opportunity.

Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed.

Go out as far as you can go and start from there

The pursuit of knowledge is more valuable than its possession.

Concepts which have proved useful for ordering things easily assume so great an authority over us, that we forget their terrestrial origin and accept them as unalterable facts. They then become labeled as 'conceptual necessities,' etc. The road of scientific progress is frequently blocked for long periods by such errors.

I refuse to make money out of my science. My laurel is not for sale like so many bales of cotton.

Anti-Semitism is nothing but the antagonistic attitude produced in the non-Jew by the Jewish group. This is a normal social reaction. The Jewish group has thrived on oppression and on the antagonism it has forever met in the world... the root cause is their use of enemies they create in order to keep solidarity.