Seth Godin thinks living with doubt is costly. He makes a good case for how much we give up (money, time, resources) for a measure of certainty. It’s a good point for those of us who are believers and live very comfortable lives.
If God is the person he claims to be and all of his promises are true, then why don’t we as believers give up the expense of certainty and live into the promises we believe? That is the crisis of faith all Christians find themselves in. If I believe the promises made to me as a father, husband, youth worker, etc., then where does doubt live in my calling?
The only real battle is in giving up the will to live life the way we want and accept life that is given to us. I label this a paradox, but I think it is more of a praxis than mystery.