Science can destroy religion by ignoring it as well as by disproving its tenets. No one ever demonstrated, so far as I am aware, the nonexistence of Zeus or Thor, but they have few followers now.

I'm quite fond of the writer who told a beginning author, "If you've got a message, use Western Union."

In all the universe there is nothing more precious than mind.

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.

Astronomy, as nothing else can do, teaches men humility.

What was more, they had taken the first step toward genuine friendship. They had exchanged vulnerabilities.

Good morning, Dr. Chandra. This is Hal. I am ready for my first lesson.