'Merely' in the Bible

For it is not those who merely hear the Law [as it is read aloud] who are just or righteous before God, but it is those who [actually] obey the Law who will be justified [pronounced free of the guilt of sin and declared acceptable to Him].

Or is God the God of Jews only? Is He not also the God of Gentiles [who were not given the Law]? Yes, of Gentiles also,

and [that he would be] the [spiritual] father of those circumcised who are not only circumcised, but who also walk in the steps of the faith of our father Abraham which he had before he was circumcised.