How do we know God's promises of grace are true?

The truth of God's promises of grace stems from His divine nature and the accomplished work of Jesus Christ. In Romans, Paul asserts that God's righteousness is revealed apart from the law, and that salvation is granted freely through faith in Christ (Romans 3:21). The concept of justification by faith underscores that God’s promises are genuine and anchored in His unchanging character. Christ’s sacrificial death satisfied God’s justice, thus all who believe receive grace—not based on their merits, but solely on faith in His finished work.