How inappropriate to call this planet Earth when it is quite clearly Ocean.

I believe any malevolent supercivilisation would have rapidly self-destructed as we may be in the process of doing ourselves. If we do have contact, physical contact with aliens, I think it will be benign.

No trilogy should have more than four books.

In my life I have found two things of priceless worth - learning and loving. Nothing else - not fame, not power, not achievement for its own sake - can possible have the same lasting value. For when your life is over, if you can say 'I have learned' and 'I have loved,' you will also be able to say 'I have been happy.

There were some things that only time could cure. Evil men could be destroyed, but nothing could be done with good men who were deluded.

When the Sun shrinks to a dull red dwarf, it will not be dying. It will just be starting to live and everything that has gone before will merely be a prelude to its real history.

Belief in God is apparently a psychological artifact of mammalian reproduction.