God sent forth his own son born of a woman, and subject to the law, to redeem those,

he, who was of the bond-woman, was born according to the ordinary course of nature; but he, who was of the free-woman, was born by virtue of the promise.

these things have an allegorical meaning: the two women signify the two covenants, the one from mount Sinai, which is represented by Agar, whose children were born in a state of servitude.

but as then, he that was born in the ordinary course of nature, persecuted him, who was born by an extraordinary power; even so it is now.