This is Paul showing his desire those Israelites who had REJECTED the Lord!
Romans 10:1 Brethren, my heart's desire and prayer to God for Israel is, that they might be saved.
Romans 10:2 For I bear them record that they have a zeal of God, but not according to knowledge.
Romans 10:3 For they being ignorant of God's righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God.
We know this, because Paul knew full well that all Israel shall be saved at the second coming!
Romans 11:26 And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
1 Thessalonians 2:14 For ye, brethren, became followers of the churches of God which in Judaea are in Christ Jesus: for ye also have suffered like things of your own countrymen, even as they have of the Jews:
1 Thessalonians 2:15 Who both killed the Lord Jesus, and their own prophets, and have persecuted us; and they please not God, and are contrary to all men:
1 Thessalonians 2:16
Forbidding us to speak to the Gentiles that they might be saved, to fill up their sins alway: for the wrath is come upon them to the uttermost.
Romans 10:14-17 KJV, 1 Corinthians 1:21 KJV
This is the fate of those like you who receive not the love of the truth (1 Corinthians 15:1-4 KJV by faith Romans 10:17 KJV).