"God never undertakes to do something He can't carry out. When He makes a promise, He will always carry it through. He has never made a promise to us that He will ever have to explain away afterwards. He will never say 'I meant to do that, but circumstances would not permit.'...God never fails to keep His promises. He is able to perform every one, and Christ is the Amen to every promise of God." (Ironside Commentary) Just like Abram, you can see the fulfillment of the promise of God to you. Start by giving glory to God - taking Him to be what He really is - Almighty and Faithful. You will find that you will not stagger at the promise of God through unbelief, but be 'strong in faith' - 'fully persuaded that what He had promised, He is able also to perform.' "