If we look for perfect models of faithfulness, we shall find one and only one–Jesus Christ. All others are flawed, for all others are sinners. Yet Abraham, who had his faults, is held up in the Letter to the Romans as a model of what faith is about. He took God at his word, when human hope was exhausted, “firm in the conviction of His power to do what He had promised” (Rom 4:21 NEB).
Walk, then, in those footprints. Don’t try to be Abraham. Don’t insist that God fulfill for you the promise given to Abraham. He is not going to make you the father of many nations. But hang on without giving place to the tiniest skepticism, to the promises given to all of us in Christ. “You are complete in Him” (Col 2:10 AV), for example. “Christ in you, the hope of glory” (Col 1:27 AV). “God shall supply all your need” (Phil 4:19 AV). “I will never leave thee nor forsake thee” (Heb 13:5 AV). Not to waver in your conviction that God means what He says is to walk in the footprints of faith.