Paul had a heart for the Jewish people. In fact, Paul loved the Jewish people so much and yearned for their salvation to such an overwhelming degree that he actually said:
Romans 9:3-5 For I could wish that I myself were accursed, separated from Christ for the sake of my brethren, my kinsmen according to the flesh, 4 who are Israelites, to whom belongs the adoption as sons and the glory and the covenants and the giving of the Law and the temple service and the promises, 5 whose are the fathers, and from whom is the Christ according to the flesh, who is over all, God blessed forever. Amen.
Paul was saying, "if it was possible - which it was not because salvation is about God's effectual call on an individual's life - to be cut off and save his kindred, he would have done it.
In Romans 10, Paul says that: Romans 10:2-3 For I bear them witness that they have a zeal for God, but not in accordance with knowledge. 3 For not knowing about God's righteousness, and seeking to establish their own, they did not subject themselves to the righteousness of God.
They want to know God. They have a great zeal for God. Yet they have rejected the Messiah. They have rejected the clear teachings of the Hebrew Scriptures leading up to and pointing to the Messiah Yeshua coming and dying for the sins of the world.
There are a lot of Jewish people that need to hear about Jesus, the Messiah. In fact, every believer (both Jewish and Gentile) need to heed the missions statement of Jews for Jesus: We exist to make the "messiahship" of Jesus an unavoidable issue to our Jewish people worldwide."
Oh how we need believers sold out to the gospel of Jesus Christ as well as those committed to taking the gospel to the nation that God chose to make a covenant with that will never fail (Gen 12, 15, 17).
To God be the glory.