And remember, in the light of the righteousness of God, all the imaginary goodness and righteousness of mere man are filthy rags (Isa.64:6). What is not of faith is sin (Rom.14:23). Righteousness is to love the Lord God with all one’s heart and mind and soul and strength, always and everywhere, in one’s whole life and with every means. All the rest is transgression of the law and worthy of eternal damnation. Remember also that God does not become angry with the wicked only in some future day of judgment, but he always judges, and he always is filled with holy wrath with regard to those who do iniquity. They are in death and stand in judgment. They lie under condemnation.
Yes, God is truly merciful and gracious, forgiving iniquity and full of lovingkindness and truth, but since his mercy cannot be divorced from his righteousness and justice, it is a righteous mercy. God can reveal his mercy only to the righteous. And since no man is righteous in himself, and all have sinned and come short of God’s glory (3:23), God can be merciful to no man on the basis of man’s own goodness and righteousness. God is merciful, indeed, and his mercy endures forever, but his mercy is revealed as a righteous mercy only in the cross of Jesus Christ, his Son, our Lord. In Christ’s atoning sacrifice, righteousness and grace, justice and mercy, embrace each other in blessed harmony. Gracious and merciful God is to those who are in Christ Jesus. For them there is no condemnation. Blessed are all who put their trust in him.
Taken from Herman Hoeksema’s radio sermon “God is Good” (based on Matthew 19:17), as found in Knowing God & Man (Reformed Free Publishing Association, 2006), p.42.