Instead of establishing another agreement whereby God will bless Abraham if Abraham fulfill's God's terms, God swears by his own sovereign majesty that he will give Abraham children and lands.
The Old Testament depicts a host of potential saviors who end up failing (often spectacularly) to show that even the best of us are not enough. Even our prospective redeemers need salvation. It is not until we get to Jesus that we find a Savior who can bear the crushing weight of our sin because he himself is sinless. Before we can understand how our hope is fulfilled in Jesus, we need to look back at the hope deferred by the would-be saviors of humanity, starting with Adam.
Adam is ...