Calvinists love to quote "the potter" from Romans 9, but never go to the OT to see what Paul was speaking of.
Jer 18:1 The word which came to Jeremiah from the LORD, saying,
2 Arise, and go down to the potter's house, and there I will cause thee to hear my words.
3 Then I went down to the potter's house, and, behold, he wrought a work on the wheels.
4 And the vessel that he made of clay was marred in the hand of the potter: so he made it again another vessel, as seemed good to the potter to make it.
5 Then the word of the LORD came to me, saying,
6 O house of Israel, cannot I do with you as this potter? saith the LORD. Behold, as the clay is in the potter's hand, so are ye in mine hand, O house of Israel.
7 At what instant I shall speak concerning a nation, and concerning a kingdom, to pluck up, and to pull down, and to destroy it;
8 If that nation, against whom I have pronounced, turn from their evil, I will repent of the evil that I thought to do unto them.
9 And at what instant I shall speak concerning a nation, and concerning a kingdom, to build and to plant it;
10 If it do evil in my sight, that it obey not my voice, then I will repent of the good, wherewith I said I would benefit them.
11 Now therefore go to, speak to the men of Judah, and to the inhabitants of Jerusalem, saying, Thus saith the LORD; Behold, I frame evil against you, and devise a device against you: return ye now every one from his evil way, and make your ways and your doings good.
Note verse 6, this is what Paul was quoting in Romans 9. Those Jews who heard him understood this.
This passage is speaking of the NATION of Israel (as was Paul in Romans 9). God is not saying he chose from the foundation of the world to save some and pass by others.
Notice in verses 7-8 that God says if a NATION turns from it's evil, he will repent of the evil he thought to do unto them.
Notice verses 9-10, God says when he speaks to build a NATION and plant it, if they do evil he will repent of the good that he had spoken concerning them.
So, this building up and planting of a nation is not unconditional. It is based upon whether a nation obeys or rebels against God.
This is what Paul was speaking of in Romans 9. Moses obeyed God, and so God built him up (and Israel). Pharaoh rebelled against God and so God pulled him (and Egypt) down.
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Another false statement......
Paul uses the Ot to prove individual election not only of Israelites...but of the Gentiles....they come in one at a time....
21Hath not the potter power over the clay, of the same lump to make one vessel unto honour, and another unto dishonour?
22What if God, willing to shew his wrath, and to make his power known, endured with much longsuffering the vessels of wrath fitted to destruction:
23And that he might make known the riches of his glory on the vessels of mercy, which he had afore prepared unto glory,
24Even us, whom he hath called, not of the Jews only, but also of the Gentiles?
25As he saith also in Osee, I will call them my people, which were not my people; and her beloved, which was not beloved.
26And it shall come to pass, that in the place where it was said unto them, Ye are not my people; there shall they be called the children of the living God.
27Esaias also crieth concerning Israel, Though the number of the children of Israel be as the sand of the sea, a remnant shall be saved:
28For he will finish the work, and cut it short in righteousness: because a short work will the Lord make upon the earth.
29And as Esaias said before, Except the Lord of Sabaoth had left us a seed, we had been as Sodoma, and been made like unto Gomorrha.
30What shall we say then? That the Gentiles, which followed not after righteousness, have attained to righteousness, even the righteousness which is of faith.
31But Israel, which followed after the law of righteousness, hath not attained to the law of righteousness.