The idea of the blessing being given to the one or ones of promise rather than the one with the birthright is carried throughout the whole of scripture. It’s sad to see people through ignorance or much worse, stubbornness, refuse a very clear teaching that enriches the truth of our faith.
"And think not to say within yourselves, We have Abraham to our father: for I say unto you, that God is able of these stones to raise up children unto Abraham."
