<p>4:24 <i>Such things contain an allegory. For these women are two covenants. One from mount Sinai, bearing children to bondage, which is Hagar</i>- The two sons are presented as being a slave and a freeborn son. This connects with the previous argument in 4:7; that we are no longer slaves under the Law, but sons. The tension between bond and free has been introduced in 3:28; in Christ there is no longer bond and free. And that is because we are &quot;in Christ&quot; and thus are all the free born children, the Son of God as He was. The argument in 3:27-29 is not so much that it simply doesn't matter of what gender, ethnicity or social status we are. Those things don't matter because we are Christ; all of us are Him. Who He was and is becomes who we are. He is the freeborn Son of God; and so we are too. Therefore there is no difference between bond and free because we are all free, the freeborn sons of God.</p>