Tertullian, Against Marcion 4.36

He commands perseverance and urgency in prayer, and to illustrate the point he tells the parable of a judge who is forced to listen to a widow because of the sheer insistence and persistence of her appeals. So he shows that God is the one to be prayed to, not himself, unless he himself is the judge. He also adds that God will carry out vengeance for his elect. If, then, the one who is also the judge will be the avenger, he has proved the Creator to be the better God, the one he shows acting as avenger for his elect crying out to him day and night. And yet, when he brings in the Creator's temple and describes two men worshiping with opposite dispositions, the Pharisee in pride and the tax collector in humility, so that one goes down rejected and the other justified, he is certainly teaching by what discipline one must pray, and here too he establishes that the one to be prayed to is the one from whom they will receive the discipline of prayer, whether it rebukes pride or justifies humility. I find no temple, no worshipers, and no judgment belonging to another god in Christ, only the Creator's: he commands worship in humility, as the helper of the humble, not in pride, as the destroyer of the proud.