Paul took this verse completely out of context. God was not talking of salvation at all. Let's see what God actually said.
Exodus 33
12 Then Moses said to the Lord, “See, You say to me, ‘Bring up this people.’ But You have not let me know whom You will send with me. Yet You have said, ‘I know you by name, and you have also found grace in My sight.’
13 Now therefore, I pray, if I have found grace in Your sight, show me now Your way, that I may know You and that I may find grace in Your sight. And consider that this nation is Your people.”
14 And He said, “My Presence will go with you, and I will give you rest.”
15 Then he said to Him, “If Your Presence does not go with us, do not bring us up from here.
16 For how then will it be known that Your people and I have found grace in Your sight, except You go with us? So we shall be separate, Your people and I, from all the people who are upon the face of the earth.”
17 So the Lord said to Moses, “I will also do this thing that you have spoken; for you have found grace in My sight, and I know you by name.”
18 And he said, “Please, show me Your glory.”
19 Then He said, “I will make all My goodness pass before you, and I will proclaim the name of the Lord before you. I will be gracious to whom I will be gracious, and I will have compassion on whom I will have compassion.”
20 But He said, “You cannot see My face; for no man shall see Me, and live.”
21 And the Lord said, “Here is a place by Me, and you shall stand on the rock.
22 So it shall be, while My glory passes by, that I will put you in the cleft of the rock, and will cover you with My hand while I pass by.
23 Then I will take away My hand, and you shall see My back; but My face shall not be seen.”
The children of Israel were a people of grace. It is not exclusive to the NT. Being a people of grace, we find they kept the law and did works. They were under the law and grace. Grace did not 'cancel' the law, and the law did not 'cancel' grace; they 'worked' together. Who knows why Paul separated them.
The whole nation of Israel found grace in God's sight. And because Moses found grace in God's sight, God did what Moses asked, that is, go with them. Moses then asked to God to show His glory. Please notice what God told Moses, '
I will make all My goodness pass before you, and I will proclaim the name of the Lord before you. I will be gracious to whom I will be gracious, and I will have compassion on whom I will have compassion.'
What we are told of God's grace being shown to Moses, Paul took it out of context to mean something else. Nothing at all is said of anyone's salvation. It says nothing about
'So then it is not of him who wills, nor of him who runs, but of God who shows mercy' (Romans 9:16). Who knows why Paul added this.
Do you remember what Paul wrote about grace?
Romans 11:6
And if by grace, then it is no longer of works; otherwise grace is no longer grace. But if it is of works, it is no longer grace; otherwise work is no longer work.
What in the world did he mean by this? The children of Israel were under the law and it was still grace. Why did Paul add this? He didn't know what the OT said. Paul had no business adding to God's word.
Deuteronomy 4:2
You shall not add to the word which I command you, nor take from it, that you may keep the commandments of the Lord your God which I command you.
Paul adds to the word of God, of which God says we are not to do. What is ironic is that what Paul added was to keep people from keeping the commandments of God. You need to do your own studying of God's word, sdowney. Paul is leading you down the path of disobedience to God's very word. Either commit your salvation to God, or to Paul's unwise words.
sdowney, I would advise you to read the OT yourself, instead of relying on someone else 'telling' you what it says.