Galatians 4:21

Tell me, ye that desire to be under the law, do ye not hear the law?

THE ALLEGORY OF ISAAC AND ISHMAEL

Desire to be under the law ... There has always been a basic natural appeal in visible, ceremonial, liturgical, external and spectacular religion, as witnessed continually by the churches of all ages in the persistent drifting into those very things. To the Galatians, so soon out of paganism, they were simply hypnotized and seduced into receiving the allegations of the Judaizers. Paul's argument, however, here seems to say, "Do not merely look at it, listen to what it teaches!" There is a lot in religion today that needs to be analyzed in the same way.

The Judaizers were talking about being "sons of Abraham," which in a sense (carnal) they were; and the thunderbolt in the next verse is that "Abraham had two sons; which kind were the Judaizers?"