A theory is just a mathematical model to describe the observations.

There is no history of mankind, there are only many histories of all kinds of aspects of human life. And one of these is the history of political power. This is elevated into the history of the world.

Every solution of a problem raises new unsolved problems.

There is no pure, disinterested, theory-free observation.

I don't know whether God exists or not. ... Some forms of atheism are arrogant and ignorant and should be rejected, but agnosticism—to admit that we don't know and to search—is all right. ... When I look at what I call the gift of life, I feel a gratitude which is in tune with some religious ideas of God. However, the moment I even speak of it, I am embarrassed that I may do something wrong to God in talking about God.

We do not know. We can only guess.

Science may be described as the art of systematic over-simplification.