God is an iron... and that's a hot one.

To be human : to strive in the face of the certainty of failure.

The day Apollo 11 landed, I knew men would walk on Mars in my lifetime. I'm no longer nearly so sure. The last budget put forward in Canada contained not a penny for Mars.

The whole world turns upside down in ten years, but you turn upside down with it.

Just as there are laws of Conservation of Matter and Energy, so there are in fact Laws of Conservation of Pain and Joy. Neither can ever be created or destroyed. But one can be converted into the other.

there's nothing in the human heart or mind, no place no matter how twisted or secret, that can't be endured - if you have someone to share it with.

Mankind is divided into two basic sorts: those who find the unknown future threatening ... and those who find it thrilling. The rupture between those two sides has been responsible for most of the bloodshed in history.