What does Psalm 1 teach about righteousness?

Psalm 1 communicates that the path to true righteousness is not found in self-righteousness or the works of man, but through a heart that delights in God's law. The blessed man, who meditates on God's Word, embodies this righteousness, contrasting sharply with the ungodly who will perish. This signifies that righteousness is imputed through faith in Christ, the only truly righteous one, rather than through our flawed attempts at adherence to the law. This aligns with the Reformed understanding that all have sinned and fall short of God's glory, thus reinforcing the necessity of Christ's righteousness for salvation.