Romans 3:5

5 But if our unrighteousness brings out God’s righteousness more clearly, what shall we say? That God is unjust in bringing his wrath on us? (I am using a human argument.)

Read Romans 3:5 Using Other Translations

But if our unrighteousness commend the righteousness of God, what shall we say? Is God unrighteous who taketh vengeance? (I speak as a man)
But if our unrighteousness serves to show the righteousness of God, what shall we say? That God is unrighteous to inflict wrath on us? (I speak in a human way.)
“But,” some might say, “our sinfulness serves a good purpose, for it helps people see how righteous God is. Isn’t it unfair, then, for him to punish us?” (This is merely a human point of view.)