Romans 9:15

For He said to Moses [Ex. 33:19], "I will show pity to whomever I want, and I will show mercy to whomever I want."

Romans 9:19

But you [i.e., probably an objecting Jew] will say to me, "Why does God still find fault [with people]? For who can [successfully] resist what God wants to do?"

Ephesians 1:11

It is in [fellowship with] Christ that we [Jewish Christians] also were selected as [God's] inheritance [i.e., to receive His never ending blessings], having been predetermined according to the plan of God, who works out everything in harmony with what He wants.

Treasury of Scripture Knowledge

Summary

Consider the work of God: for who can make that straight, which he hath made crooked?

Bible References

Who

Romans 9:15
For He said to Moses [Ex. 33:19], "I will show pity to whomever I want, and I will show mercy to whomever I want."
Ephesians 1:11
It is in [fellowship with] Christ that we [Jewish Christians] also were selected as [God's] inheritance [i.e., to receive His never ending blessings], having been predetermined according to the plan of God, who works out everything in harmony with what He wants.