What about... Isaac?

Remember in John when all the people were arguing with Jesus about their lineage?

Joh 8:39
(39) They answered and said to Him, Abraham is our father. Jesus said to them, If you were children of Abraham, you would do the works of Abraham.


Notice how the people were enamored with being the 'seed' of Abraham. If we go back to Genesis and read, Abraham had multiple children, including Ishmael. You would think that if the people really cared about being heir to the Promise, they would clarify. "We are children of Abraham and Isaac!"

Do you know why they didn't? Because although they thought they knew and understood the father, they forgot the son. Does this have a familiar ring?

Rom 9:6-8
(6) Not, however, that God's Word has failed. For not all those of Israel are Israel,
(7) nor because they are Abraham's seed are all children, but "In Isaac a Seed shall be called to you." Gen. 21:12
(8) That is: Not the children of flesh are children of God, but the children of the promise are counted for a seed.

You know... Isaac was so important. He was the child of promise. Without promise, there is no need for faith. I can sit around all day and hope the house next door becomes a huge piece of chocolate, but believing that is moronic because it hasn't been promised by God. In what or whom do we have faith?

If Abraham was a picture of God the Father, and Isaac a picture of the Son (in that the Father was willing to sacrifice the Son), is it really any wonder they never mentioned the Son?