Man is, at one and the same time, a solitary being and a social being.

A desk, some pads, a pencil, and a large basket -- to hold all of mu mistakes.

The pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives.

When the number of factors coming into play in a phenomenological complex is too large scientific method in most cases fails. One need only think of the weather, in which case the prediction even for a few days ahead is impossible.

Nobody knows how the stand of our knowledge about the atom would be without him. Personally, [Niels] Bohr is one of the amiable colleagues I have met. He utters his opinions like one perpetually groping and never like one who believes himself to be in possession of the truth.

I am content in my later years. I have kept my good humor and take neither myself nor the next person seriously.

As the area of light expands, so does the perimeter of darkness.