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

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!"

The infinite! No other question has ever moved so profoundly the spirit of man.

[On Cantor's work:] The finest product of mathematical genius and one of the supreme achievements of purely intellectual human activity.

Physics is much too hard for physicists.

I do not see that the sex of the candidate is an argument against her admission as a Privatdozent. After all, the Senate is not a bathhouse. Objecting to sex discrimination being the reason for rejection of Emmy Noether's application to join the faculty at the University of Gottingen.

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