What we observe is not nature itself but nature exposed to our method of questioning. Our scientific work in physics consists in asking questions about nature in the language that we possess and trying to get an answer from experiment by the means that are at our disposal.

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

The conception of objective reality ... has thus evaporated ... into the transparent clarity of mathematics that represents no longer the behavior of particles but rather our knowledge of this behavior.

The 'path' comes into existence only when we observe it.

Even for the physicist the description in plain language will be a criterion of the degree of understanding that has been reached.

The structure underlying the phenomena is not given by material objects like the atoms of Democritus but by the form that determines the material objects. The Ideas are more fundamental than the objects.

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