I am exclusively occupied with the problem of gravitation and hope with the help of a local mathematician friend [Marcel Grossman] to overcome all the difficulties. One thing is certain, however, that never in life have I been quite so tormented. A great respect for mathematics has been instilled within me, the subtler aspects of which, in my stupidity, I regarded until now as pure luxury.

Mathematics are well and good but Nature keeps dragging us around by the nose.

Qualities I sought in a scientific theory were naturalness, inner perfection and logical simplicity from an aesthetic approach.

He who finds a thought that lets us a little deeper into the eternal mystery of nature has been granted great peace.

The attempt to combine wisdom and power has only rarely been successful and then only for a short while.

An evening everyone agrees, is a lost evening.

The significant problems we have cannot be solved at the same level of thinking with which we created them.