Why is salvation by grace emphasized in Christianity?

Christian doctrine emphasizes salvation by grace alone due to humanity's total inability to achieve righteousness on their own. According to scriptures like Ephesians 2:8-9, it is by grace we are saved, not by works that anyone can boast. The sermon asserts that any attempt to negotiate our salvation through actions or free will is ultimately futile, as all righteousness is as filthy rags when compared to God's holiness. This gracious provision highlights God's mercy and the necessity of His intervention for any hope of redemption.