In the article I posted by Greg Boyd he said:
"Throughout Romans 9 through 11 Paul was at pains to show that God’s goal all along had been to reach out beyond the borders of Israel and win the whole world (Rom 9:25-26, 33; 10:10-21; 11:11-12). Indeed, Paul insisted God was yet going to attain his goal. But since Israel as a nation had rejected the Messiah, Paul argued, God was now going to use their blindness rather than their obedience to achieve it (Rom. 11:11-32).
In Jeremiah 18 the Lord showed Jeremiah a potter who was working on a vessel that didn’t turn out right. So the potter revised his plan and formed a different kind of pot out of it (Jere 18:1-4). In the same way, the Lord said, since he is the potter and Israel is the clay, he has the right and is willing to “change his mind” about his plans for Israel if they will simply repent (Jere. 18:4-11).
In Jeremiah 18 the Lord showed Jeremiah a potter who was working on a vessel that didn’t turn out right. So the potter revised his plan and formed a different kind of pot out of it (Jere 18:1-4). In the same way, the Lord said, since he is the potter and Israel is the clay, he has the right and is willing to “change his mind” about his plans for Israel if they will simply repent (Jere. 18:4-11). Indeed, the Lord announced that whenever he’s going to judge a nation, he is willing to change his mind if the nation repents. Conversely, whenever God announces that he’s going to bless a nation, he will change his mind if that nation turns away from him. In other words, the point of the potter-clay analogy is not God’s unilateral control, but God’s willingness and right to change his plans in response to changing hearts.
The passage fits perfectly with the point Paul is making in Romans 9. While some individual Jews had accepted Jesus as the Messiah, the nation as a whole had rejected Jesus, and thus rejected God’s purpose for themselves (cf. Lk 7:30). Hence, though God had previously blessed Israel, he was now changing his mind about them and was hardening them. Ironically, and shockingly, the Jews were finding themselves in the same position as their old nemesis Pharaoh. He had hardened his heart toward God, so God responded by hardening him further in order to raise him up to further his own sovereign purposes (Rom 9: 17). So too, Paul was arguing, God was now hardening the Jews in their self-chosen unbelief to further his sovereign purposes. He was going to use their rebellion to do what he had always hoped their obedience would do: namely, bring the non-Jewish world into a relationship with him (Rom 11:11-12)."