To what extent. On what conditions. That Mercy is an attribute of God. Show what Mercy is not. Not mere goodness.
Justice is as much an attribute of goodness as mercy is.
Mercy is not mere grace. Show what Mercy is. Mercy is a disposition to pardon crime. Its exercise consists in the arresting and setting aside the execution of law, when its penalty has been incurred by disobedience. It is in reference to crime the exact opposite of justice.