John Kennedy actually said...

I must say that it gives me the greatest satisfaction that it's taking place at this time.

I wish that all Americans could hear that litany of countries that you're going to, your willingness to do it.

This is an extraordinary action by this country, and I know that you are proud to take part in it.

So I hope that you will regard this as the first installment in a long life of service in the most exciting career in the most exciting time...