To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.

We must build a world in which there shall be no economic domination, no exploitation, no unemployment, and no war.

"Die Kunst des Schreibens besteht darin, die Welt so zu beschreiben, wie sie ist, und gleichzeitig so, wie sie sein könnte."