This video contains the complete speech given by President John F. Kennedy at Rice Stadium on Sept 12. This is his famous "moon speech" in which he spoke about his intention to have Americans walk on the moon before the end of the decade.
You can read the full transcript of the speech here.
"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 goal will serve to organize and measure the best of our energies and skills, 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