What does the Bible say about Israel's spiritual emptiness?

In Romans 10, Paul expresses his sorrow over Israel's spiritual condition, emphasizing that they had a zeal for God but lacked understanding. Paul states that they were ignorant of God's righteousness and attempted to establish their own, failing to submit to God's way of righteousness. Despite having the word of faith and hearing the gospel preached to them, they did not mix it with faith, resulting in spiritual emptiness. This highlights a critical aspect of human nature, as both Jews and Gentiles are depicted as needing divine grace to perceive the truth of the gospel.