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

The Apostle Paul expresses deep sadness over Israel's spiritual condition, highlighting their zeal for God but pointing out that it was not based on knowledge. In Romans 10:2-3, he notes that they were ignorant of God's righteousness and sought to establish their own, failing to submit to the righteousness that comes from God. This reflects a broader theme in Scripture where many hear the gospel yet do not truly respond to it in faith, indicating a deeper spiritual dilemma present within Israel and humanity as a whole.