Crash programs fail because they are based on theory that, with nine women pregnant, you can get a baby in a month.

It takes sixty-five thousand errors before you are qualified to make a rocket.

I believe in an immortal soul. Science has proved that nothing disintegrates into nothingness. Life and soul, therefore, cannot disintegrate into nothingness, and so are immortal.

The same forces of nature which enable us to fly to the stars, enable us also to destroy our star.

Looking back, nothing seems so simple than a utopian vision realised.

Man is not made for space. But with the help of biologists and medical doctors, he can be prepared and accommodated.

For my confirmation, I didn't get a watch and my first pair of long pants, like most Lutheran boys. I got a telescope. My mother thought it would make the best gift.