Intent of the Law

Brothers and sisters, I speak in terms of human relations: even though it is only a man’s covenant, yet when it has been ratified, no one sets it aside or adds conditions to it.

Now the promises were spoken to Abraham and to his seed. He does not say, “And to seeds,” as one would in referring to many, but rather as in referring to one, “And to your seed,” that is, Christ.

This is speaking allegorically, for these women are two covenants: one coming from Mount Sinai giving birth to children who are to be slaves; she is Hagar.