Does he who supplies the Spirit to you and works miracles among you do so by works of the law, or by hearing with faith?

For all who rely on works of the law are under a curse; for it is written, "Cursed is everyone who does not abide by all things written in the book of the law, to do them."

But the Law is not of faith; on the contrary, "He who does them shall live by them."

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

What I mean is this: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise.

Now a mediator does not represent just one party; but God is one.

For it is written, "Rejoice, O barren woman who does not bear; break forth and shout, you who are not in labor; for the children of the desolate are more numerous than the children of her who has a husband."

But what does the scripture say? "Cast out the slave and her son, for the son of the slave shall not inherit with the son of the free woman."