I couldn't resist this. Today my kids were watching Power Rangers: Dino Thunder. Here's what I heard, "you can't make someone do something not in their nature. No, but you can change their nature!"
Amen. You can't make an unregenerate rebel believe - it's not in their nature. It takes a recreated nature, a new birth. This is the sovereign work of God. Just like in Power Rangers.
(I know I'm setting myself up for abuse, so I'll start the ball rollin': Doug, "Guess you had to learn Calvinism from somewhere cause I know you didn't learn it from the Bible". )