How do we know that Noah was righteous before God?

The declaration of Noah's righteousness in Genesis 7:1 illustrates an essential aspect of sovereign grace theology. God sees Noah as righteous, which means that God has imputed righteousness to him, making him acceptable in the sight of a holy God. This understanding is rooted in the grace of God and the work of Christ, which transcends time. Even before Christ's redemptive work, God can declare Noah righteous because His righteousness is given freely through grace. This divine declaration foreshadows the ultimate righteousness that believers receive through faith in Jesus Christ, emphasizing that justification is not based on works but on God's grace alone.