“You need to have extraordinary wisdom to be the forerunner.”

“I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettie...”

“To know the history of science is to recognize the mortality of any claim to universal truth. ”

“The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists.”

“I am not saying that Hitler was a choir boy. But I am saying, let him who was innocent in the Second World War cast the first stone.”

“Who I am as a guitarist is defined by my failure to become Jimi Hendrix.”

“Pride is ugly. It says, 'If you succeed, I am a failure.'”

“I can accept failure, everyone fails at something. But I can't accept not trying.”

“I was trying to be this person who is cool, eternally rocking.”

“That's what we want to do here at Johnson Space Center. I think what we have always brought to NASA and brought to the country is trying to push the boundaries, trying to go to the next level.”