I am doing just fine, considering that I have triumphantly survived Nazism and two wives.

I cannot seriously believe in it [quantum theory] because the theory cannot be reconciled with the idea that physics should represent a reality in time and space, free from spooky actions at a distance [spukhafte Fernwirkungen].

Understanding physics is child's play when compared to understanding child's play.

Intelligence is not the ability to store information, but to know where to find it.

Knowledge exists in two forms - lifeless, stored in books, and alive, in the consciousness of men. The second form of existence is after all the essential one; the first, indispensable as it may be, occupies only an inferior position.

Necessity is the mother of all invention.

I have never looked upon ease and happiness as ends in themselves. This ethical basis I call the ideal of the pigsty.