"I tell the audience that I have a fifty dollar note in my hand and ask for a volunteer who believes me. Usually only a few hands go up. Then I tell the volunteer that I am about to destroy his faith. I open my hand and show the fifty dollar note. The reason I can say I am destroying his faith is that now he knows I hold the note. He sees the note and doesn't need faith anymore. Faith is required only when we have doubts. When knowledge comes, faith is no more.

Sometimes a person is tempted to think, I can't be a Christian because I still have doubts. I'm still not sure. But as long as doubts exist, as long as the person is still uncertain, that is the only time faith is needed. When the doubts are gone, the person doesn't need faith anymore. Knowledge has come."