Our calling and election by God preceded even the slightest fragment of saving knowledge of God and thus our having faith in Him. Therefore, we could not possibly earn any grace of God, even as Jacob could not. As a vivid illustration for us, God deliberately chose to do this before Jacob could possibly do any works pertaining to salvation.
An almost overwhelming nugget of truth may be gleaned from these verses. If God is revealing here His general pattern which He follows to call all of those He is choosing to save at this time, then it shows that our personal calling and election into His spiritual creation is in no way random but very specific, even as Jacob's was.
Perhaps we, like Jacob was, are called from the womb so that, like him, there will never be any doubt that even the tiniest of our works had a part in saving us. There is precedent for this in Jeremiah 1:5 about Jeremiah's birth and calling; in Luke 1:11-17 about John the Baptist; and in Psalm 139:14-16 about David.
We might think that these were really great personages, people important to God's purpose. They were indeed, but are we not part of the same spiritual Body and part of the same Family as they are? Does not God say that there is no partiality with Him in Romans 2:11? Every part of the Body of Jesus Christ is important. Enough is revealed in Scripture for us to give this serious consideration.