So far Paul has reasoned in general terms which apply to both Jews and Gentiles, and has laid the foundation for what he wants to say, but now he specifically addresses the Jews. ‘Behold, thou art called a Jew, and restest in the law.
This blindness is found in all human beings. Knowledge can so easily substitute for compliance with the will of God, and we can convince ourselves that it is enough. We want others to assume that if we know something, we also do it. But there are many steps between knowledge and obedience. We can know what God wants us to do, and resent his commands. We can use our knowledge to boast with our tongues, and leave out the harder step of putting into practice. We can desire to be accepted by the community of God’s people, and think that they will not be able to see what is really going on in our hearts.