Some people have got a mental horizon of radius zero and call it their point of view.

For us there is no ignorabimus, and in my opinion none whatever in natural science. In opposition to the foolish ignorabimus our slogan shall be: "We must know - we will know!"

One can measure the importance of a scientific work by the number of earlier publications rendered superfluous by it

If one were to bring ten of the wisest men in the world together and ask them what was the most stupid thing in existence, they would not be able to discover anything so stupid as astrology.

He who seeks for methods without having a definite problem in mind seeks in the most part in vain.

We do not master a scientific theory until we have shelled and completely prised free its mathematical kernel.

Besides it is an error to believe that rigour is the enemy of simplicity. On the contrary we find it confirmed by numerous examples that the rigorous method is at the same time the simpler and the more easily comprehended. The very effort for rigor forces us to find out simpler methods of proof.