The important thing is to never stop questioning. Never lose a holy curiosity.

It is open to every man to choose the direction of his striving; and also every man may draw comfort from Lessing's fine saying, that the search for truth is more precious than its possession.

The economic anarchy of capitalist society as it exists today is, in my opinion, the real source of evil.

Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed.

People like us, who believe in physics, know that the distinction between past, present, and future is only a stubbornly persistent illusion.

I cannot then believe in this concept of an anthropomorphic God who has the powers of interfering with these natural laws. As I said before, the most beautiful and most profound religious emotion that we can experience is the sensation of the mystical. And this mysticality is the power of all true science.

As a human being, one has been endowed with just enough intelligence to be able to see clearly how utterly inadequate that intelligence is when confronted with what exists.