How do we know God's covenant of grace is certain?

The surety of God's covenant of grace is affirmed in Isaiah 54:10, where God promises that His kindness and the covenant of peace will not be removed. This covenant was established through the blood of Christ, who secured righteousness and salvation for those chosen by God. As seen in Titus 1:2, we understand that God cannot lie and that His promises are irrevocable. This covenant guarantees that all believers can rest assured in their salvation, as it is grounded in God's unchanging character and His everlasting mercy.