The one who insists on never uttering an error must remain silent.

The world thus appears as a complicated tissue of events, in which connections of different kinds alternate or overlap or combine and thereby determine the texture of the whole.

A consistent pursuit of classical physics forces a transformation in the very heart of that physics.

The ontology of materialism rested upon the illusion that the kind of existence, the direct "actuality" of the world around us, can be extrapolated into the atomic range. This extrapolation is impossible, however.

Every word or concept, clear as it may seem to be, has only a limited range of applicability.

The Same organizing forces that have shaped nature in all her forms are also responsible for the structure of our minds.

Whether we electrons, light quanta, benzol molecules, or stones, we shall always come up against these two characteristics, the corpuscular and the undular.