Faith

Here's the thing about faith: if you have it, you don't need proof. That's kind of the point. Another thing I've observed is that once you open yourself up to faith you tend to see the proof you no longer need. Which, when you think about it, is kind of cool because this "new" proof now reinforces your faith. When you balance the faith/proof accounting ledger at the end of the day, you find that you really don't need a lot of faith. Only about as much as, say, a mustard seed...