Some people believe God's promises can't possibly be true, or they wouldn't be in the circumstances they are in. I've been guilty of that in the past (even though I've hardly suffered any great tragedy in my life).
Other people believe God's promises will come true some day. For now, we just repeat them to ourselves, soothing ourselves with the familiar words but not expecting them to impact life today.
But I'm coming to think the real life of faith scrutinizes the details of God's promises, and also scrutinizes the details of our present circumstances, and lays the discrepancy between the two before Him in prayer. The promises will not be totally fulfilled in this life, but they can be fulfilled to a greater degree than we might imagine.