“All one can really leave one's children is what's inside their heads. Education, in other words, and not earthly possessions, is the ultimate legacy, the only thing that cannot be taken away.”

“In future utopia will need to hurry to keep up with reality.”

“I'm convinced that before the year 2000 is over, the first child will have been born on the moon.”

“It [the rocket] will free man from his remaining chains, the chains of gravity which still tie him to this planet. It will open to him the gates of heaven.”

“There is just one thing I can promise you about the outer-space program - your tax-dollar will go further.”

“Research is what I'm doing when I don't know what I'm doing.”

“I personally think humans have got about as far as we can go. We're wrecking the planet. We're never short of good reasons to massacre each other. Wrong god. Wrong race. Wrong color. Wrong sex. I'm...”

“Of the two powers, the two categories that take possession of us when we enter the world, space is by far the less mysterious. . . . Space is, after all, solid, monolithic. . . . Time, on the other...”

“The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary master...”

“A human being is a part of the whole, called by us "Universe", a part limited in time and space.”