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.”
The slave does not continue in the house for ever; the son continues for ever.
God has not rejected his people whom he foreknew. Do you not know what the scripture says of Elijah, how he pleads with God against Israel?
For what does the scripture say? “Abraham believed God, and it was reckoned to him as righteousness.”
But the scripture consigned all things to sin, that what was promised to faith in Jesus Christ might be given to those who believe.
And the scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, “In you shall all the nations be blessed.”
For it is written that Abraham had two sons, one by a slave and one by a free woman.
So, brethren, we are not children of the slave but of the free woman.
Or do you suppose it is in vain that the scripture says, “He yearns jealously over the spirit which he has made to dwell in us”?