"The exploration of space is a truly human endeavor."

"Not joining [the Nazi Party] would have meant that I would have had to abandon the work of my life."

"Don’t tell me that man doesn’t belong out there. Man belongs wherever he wants to go."

"I have never seen a rocket that didn't want to fly."

"We knew that we had created a new means of warfare, and the question as to what to do with it was a moral problem for the world, not for us."