Romans 10:1

Brethren, my heart’s desire and prayer to God for Israel is, that they might be saved.

Paul's expressed longing was a deep and heartfelt desire joined with prayer to God that Israel might be saved. It was directed toward his Jewish brethren, for whom he yearned that salvation would be realized. His intercession for them was not momentary but persistent, continuing as an earnest burden for their souls.

What he desired for them was that they would clearly understand the gospel. That clear understanding meant recognizing Jesus of Nazareth as the promised Messiah.