There are two ways of exerting one's strength: one is pushing down the other is pulling up.

We need the kind of leadership exemplified by President Kennedy to just do it! But we must do it as good stewards aggressively exerting control over the moon. We can best do this by going there.

Some men give up their designs when they have almost reached the goal While others on the contrary obtain a victory by exerting at the last moment more vigorous efforts than ever before.