Galatians 4:28
“Now we, brethren, as Isaac was, are the children of promise.”
We are the children of promise in more ways than one. We are the children of a promise made unto Abraham just as Isaac was for it was promised to Abraham that he would be the father of many nations. He is the father in our lineage of faith as Paul has proven over and over again throughout the book of Galatians. He is not the father to just the Jews but rather to all that have faith such as he displayed. And yet we are the children of a greater promise which is the promise of eternal salvation made before the foundation of the world. Just as God had a covenant with Abraham he made a covenant with his own Son for the redemption of a chosen people. In that covenant you were known and were promised to be brought forth unto eternal life. Certainly, we are as Isaac and are the children of promise.
Additional Reading:
Acts 3:25