Paul covers this issue in Romans 9...
14What shall we say then? There is no injustice with God, is there? May it never be!
15For He says to Moses, “I WILL HAVE MERCY ON WHOM I HAVE MERCY, AND I WILL HAVE COMPASSION ON WHOM I HAVE COMPASSION.”
16So then it
does not
depend on the man who wills or the man who runs, but on God who has mercy.
17For the Scripture says to Pharaoh, “FOR THIS VERY PURPOSE I RAISED YOU UP, TO DEMONSTRATE MY POWER IN YOU, AND THAT MY NAME MIGHT BE PROCLAIMED THROUGHOUT THE WHOLE EARTH.”
18So then He has mercy on whom He desires, and He hardens whom He desires.
19You will say to me then, “Why does He still find fault? For who resists His will?”
20On the contrary, who are you, O man, who answers back to God? The thing molded will not say to the molder, “Why did you make me like this,” will it?
21Or does not the potter have a right over the clay, to make from the same lump one vessel for honorable use and another for common use?
22What if God, although willing to demonstrate His wrath and to make His power known, endured with much patience vessels of wrath prepared for destruction?
23And
He did so to make known the riches of His glory upon vessels of mercy, which He prepared beforehand for glory,
24even us, whom He also called, not from among Jews only, but also from among Gentiles.
