Those wanderers must have looked on Earth, circling safely in the narrow zone between fire and ice, and must have guessed that it was the favourite of the Sun's children.

When one has to ask, "Am I really in love?" the answer is always "No".

Overhead, without any fuss, the stars were going out.

I don't pretend we have all the answers. But the questions are certainly worth thinking about.

Every revolutionary idea seems to evoke three stages of reaction. They may be summed up by the phrases: 1- It's completely impossible. 2- It's possible, but it's not worth doing. 3- I said it was a good idea all along.

It has yet to be proven that intelligence has any survival value.

Science is the only religion of mankind.