A desert nomad looks up at the sky. The voice of God comes to him saying, "Do not be afraid, Abram. I am your shield, your very great reward." But Abram is disappointed with God. "You have given me no children," Abram complains, "so a servant in my household will be my heir." Then the word of the LORD comes to Abram: "This man will not be your heir, but a son coming from your own body will be your heir." God invites Abram outside and says, "Look up at the heavens and count the stars if indeed you can count them." Then God makes a promise, "So shall your offspring be."
Bound by a promise. A promise from God. And God was faithful to that promise. Today the physical offspring of Abram number in the millions and the spiritual offspring number many times more. Character is forged and character is revealed by the promises we make and the promises we keep. God never makes a promise that God does not keep.