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

Physics is becoming too difficult for the physicists.

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!"

I didn't work especially hard at mathematics at school, because I knew that's what I'd be doing later.

Is mathematics doomed to suffer the same fate as other sciences that have split into separate branches?... Mathematics is, in my opinion, an indivisible whole... May the new century bring with it ingenious champions and many zealous and enthusiastic disciples.

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

Mathematical science is in my opinion an indivisible whole, an organism whose vitality is conditioned upon the connection of its parts.