How do we know that God's grace is unconditional?

The sermon explains that the grace of God is unconditional, as it is not based on human merit but springs from God's sovereign will. Romans 8:30 shows that God predestines, calls, justifies, and glorifies His people solely based on His grace and purpose, not by any actions of our own. The covenant between the Father and the Son assures that grace is a gift, as evidenced in Ephesians 2:8-9, which states that salvation is not a result of works but a gift from God. This points to a grace that is secure and unchangeable, rooted deeply in God's immutable character.