"...for we meet in an hour of change and challenge, in a decade of hope and fear, in an age of both knowledge and ignorance. The greater our knowledge increases, the greater our ignorance unfolds."
"Despite the striking fact that most of the scientists that the world has ever known are alive and working today... the vast stretches of the unknown and the unanswered and the unfinished still far outstrip our collective comprehension."
"No man can fully grasp how far and how fast we have come, but..."
"...[If] our progress teaches us anything, it is that man, in his quest for knowledge and progress, is determined and cannot be deterred. The exploration of space will go ahead, whether we join it or not
and it is one of the great adventures of all time..."