Whedon's Commentary on the Bible - Galatians 4:28
28. We, brethren The direct application of the allegory to the present company. We Not as seeking circumcision, but as reposing faith in Christ. As Isaac… children of promise Isaac’s miraculous generation is type of our miraculous regeneration. The promise of his birth, first made by Jehovah to Abraham, is part of the covenant by which man is regenerate through Christ. read more
Whedon's Commentary on the Bible - Galatians 4:27
27. Written St. Paul adorns his allegory with a choice gem from old prophetic poetry. Isaiah 54:1. The passage is clearly Messianic, and is spoken in view of the gathering in of the Gentiles, Galatians 4:3. She who was barren, and that travailed not, has now a numerous offspring. The barrenness, according to Paul, is the effeteness of fallen Judaism, and the new fertility is the life and increase of new Christianity. read more