When you are courting a nice girl an hour seems like a second.

Berlin is the place to which I am most closely bound by human and scientific ties.

I get the most joy in life out of music.

The State idea is not according to my heart. I cannot understand why it is needed. It is connected with narrow-minded and economic obstacles. I believe it is bad. I have always been against it.

Everything that the human race has done and thought is concerned with the satisfaction of deeply felt needs and the assuagement of pain. One has to keep this constantly in mind if one wishes to understand spiritual movements and their development. Feeling and longing are the motive force behind all human endeavor and human creation, in however exalted a guise the latter may present themselves to us.

I see in Nature a magnificent structure... that must fill a thinking person with a feeling of humility.

We cannot get to where we dream of being tomorrow unless we change our thinking today.