But God said to Abraham, “Don’t be troubled about the boy and the slave woman. Do whatever Sarah tells you. The descendants I promised you will be from Isaac.
Do the things that show you really have changed your hearts and lives. Don’t begin to say to yourselves, ‘Abraham is our father.’ I tell you that God could make children for Abraham from these rocks.
Abraham’s son from the slave woman was born in the normal human way. But the son from the free woman was born because of the promise God made to Abraham.
We are the ones who are truly circumcised. We worship God through his Spirit, and our pride is in Christ Jesus. We do not put trust in ourselves or anything we can do,