Before we understand science, it is natural to believe that God created the universe. But now science offers a more convincing explanation.

We shouldn't be surprised that conditions in the universe are suitable for life, but this is not evidence that the universe was designed to allow for life. We could call order by the name of God, but it would be an impersonal God. There's not much personal about the laws of physics.

I used to think information was destroyed in black hole. This was my biggest blunder, or at least my biggest blunder in science.

Observations indicate that the universe is expanding at an ever-increasing rate. It will expand forever, getting emptier and darker. Although the universe doesn’t have an end, it had a beginning in the Big Bang. One might ask what is before that but the answer is that there is nowhere before the Big Bang just as there is nowhere south of the South Pole.

Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.

I think the next [21st] century will be the century of complexity. We have already discovered the basic laws that govern matter and understand all the normal situations. We don't know how the laws fit together, and what happens under extreme conditions. But I expect we will find a complete unified theory sometime this century. The is no limit to the complexity that we can build using those basic laws.

I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first.