It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was 29 years.

The development of full artificial intelligence could spell the end of the human race.

All that my work has shown is that you don't have to say that the way the universe began was the personal whim of God.

The doctor who diagnosed me with ALS, or motor neuron disease, told me that it would kill me in two or three years.

What was God doing before the divine creation? Was he preparing hell for people who asked such questions?

The universe doesn't allow perfection.

The human capacity for guilt is such that people can always find ways to blame themselves