If my theory of relativity is proven successful, Germany will claim me as a German and France will declare me a citizen of the world. Should my theory prove untrue, France will say that I am a German, and Germany will declare that I am a Jew.

One does not make wars less likely by formulationg rules of warfare... war cannot be humanized. It can only be eliminated.

Matter is spirit reduced to point of visibility.

Things you can get access to, you should never memorize.

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

The great need to grasp principles had caused me to spend most of my time on fruitless persuits.

All such action would cease if those powerful elemental forces were to cease stirring within us.