Sometimes, we will have to make a 100 percent commitment to something even thought we do not have 100 percent certainty in our beliefs about it. When we can live in the midst of uncertainty with joyful and courageous commitment, we will change. We will become, maybe not more certain, but more faithful. And faithfulness matters more than certainty. It just doesn't feel as good.
What matters then is not certainty, but faithfulness. When certainty is not possible, faithfulness is still on the table.