To be free means to be independent, not to be influenced by what others think and say.

This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.

You must be aware that most men (and also not only a few women) are by nature not monogamous. This nature makes itself even more forceful when tradition and circumstance stand in an individual's way.

The only thing that interferes with my learning is my education.

This is what the painter, the poet, the speculative philosopher, and the natural scientists do, each in his own fashion.

When we first got married, we made a pact. It was this: In our life together, it was decided I would make all of the big decisions and my wife would make all of the little decisions. For fifty years, we have held true to that agreement. I believe that is the reason for the success in our marriage. However, the strange thing is that in fifty years, there hasn’t been one big decision.

There is separation of colored people from white people in the United States. That separation is not a disease of colored people. It is a disease of white people. I do not intend to be quiet about it.