You cannot beat a roulette table unless you steal money from it.

If one holds these high principles clearly before one's eyes, and compares them with the life and spirit of our times, then it appears glaringly that civilized mankind finds itself at present in grave danger. In the totalitarian states it is the rulers themselves who strive actually to destroy that spirit of humanity. In less threatened parts it is nationalism and intolerance, as well as the oppression of the individuals by economic means, which threaten to choke these most precious traditions.

If one day you have to choose between the world and love, remember this: If you choose the world you’ll be left without love, but if you choose love, with it you will conquer the world

It is only men who are free, who create the inventions and intellectual works which to us moderns make life worth while.

The health of society thus depends quite as much on the independence of the individuals composing it as on their close political cohesion.

Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.

Man, surrounded by facts, permitting himself no surprise, no intuitive flash, no great hypothesis, no risk, is in a locked cell. Ignorance cannot seal the mind and imagination more securely.