In the long history of human affairs, common sense doesn’t have the greatest track record.

I knew how many zeroes there were in a quintillion, but I thought that algebra lived in ponds.

If you had to relive your life exactly as it was – same successes and failures, same happiness, same miseries, same mixture of comedy and tragedy – would you want to? Was it worth it?

In the long history of human affairs, common sense doesn’t have the greatest track record.

The most important thing I learned [...] was that when a person dies he only appears to die. He is still very much alive in the past, so it is very silly for people to cry at his funeral. All moments, past, present and future, always have existed, always will exist.

Fear distorts the world. Fear sees demons where only shadows dwell.

Even very low-probability events can, and indeed do, occur.