11. Abraham let himself be circumcised to show that he had been accepted because of his faith even before he was circumcised. This makes Abraham the father of all who are acceptable to God because of their faith, even though they are not circumcised.
12. This also makes Abraham the father of everyone who is circumcised and has faith in God, as Abraham did before he was circumcised.
13. God promised Abraham and his descendants that he would give them the world. This promise wasn't made because Abraham had obeyed a law, but because his faith in God made him acceptable.