What does the Bible say about sin and salvation according to Isaiah?

In the book of Isaiah, particularly chapter 1, the prophet emphasizes the state of sin within Israel, indicating that despite their religious practices, they provoke God through their works. Isaiah highlights that true deliverance from sin is not through the law or personal merit but only through grace. He asserts that God's people, those He has chosen, acknowledge their utter inability to attain righteousness on their own. It is only by recognizing their need for divine intervention and mercy that they can hope for salvation, as outlined in passages like Isaiah 1:4 and Ephesians 2:8-9 which emphasize God's grace as the sole means of redemption.