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

In this age of space flight, when we use the modern tools of science to advance into new regions of human activity, the Bible... remains in every way an up-to-date book. Our knowledge and use of the laws of nature that enable us to fly to the Moon also enable us to destroy our home planet with the atom bomb. Science itself does not address the question whether we should use the power at our disposal for good or for evil. The guidelines of what we ought to do are furnished in the moral law of God.

For me, the idea of a creation is not conceivable without invoking the necessity of design. One cannot be exposed to the law and order of the universe without concluding that there must be design and purpose behind it all.

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

We can lick gravity, but sometimes the paperwork is overwhelming.

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

There are flying grandfathers. But I intend to be an orbiting grandfather.