Premise: Calvinists teach that God exercises His Sovereignty in the predestination, calling, and sanctification of believers. Text: Romans 11:29 For the gifts and calling of God are irrevokable (without repentance KJV). Conclusion: If God's calling and gifts to individual believers are irrevokable, then this should also be true concerning national Israel as his undeserving-called and undeserving-blessed nation through Abraham who did not ask God to call him. Jeremish 31:31-34 is the New Covenant promise and it is in the context of 31:35,36. What do we do with the word "nation" of 31:36? 35 Thus saith the LORD, which giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, which divideth the sea when the waves thereof roar; The LORD of hosts is his name: 36 If those ordinances depart from before me, saith the LORD, then the seed of Israel also shall cease from being a nation before me for ever.