I really like this excerpt from a speech that JFK gave, maybe because of the man, the achievement, the time frame or the attitude. Actually: probably all of the above.
“We choose to go to the moon. We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard… Because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win.”
-John F. Kennedy, Rice University, 1962