Politicians should read science fiction, not westerns and detective stories.

I'm sometimes asked how I would like to be remembered. I've had a diverse career as a writer, underwater explorer, space promoter and science populariser. Of all these, I want to be remembered most as a writer - one who entertained readers, and, hopefully, stretched their imagination as well.

After their encounter on the approach to Jupiter, there would aways be a secret bond between them---not of love, but of tenderness, which is often more enduring.

Religion is a byproduct of fear.

I am an optimist. Anyone interested in the future has to be otherwise he would simply shoot himself.

Moses Kaldor had always loved mountains; they made him feel nearer to the God whose nonexistence he still sometimes resented.

It was one thing to have guessed it, another to have had that guess confirmed beyond possibility of refutation.