3 Marcion, therefore, himself, by dividing God into two, maintaining one to be good and the other judicial, does in fact, on both sides, put an end to deity. For he that is the judicial one, if he be not good, is not God, because he from whom goodness is absent is no God at all; and again, he who is good, if he has no judicial power, suffers the same [loss] as the former, by being deprived of his character of deity. And how can they call the Father of all wise, if they do not assign to Him a judicial faculty?
For if He is wise, He is also one who tests [others]; but the judicial power belongs to him who tests, and justice follows the judicial faculty, that it may reach a just conclusion; justice calls forth judgment, and judgment, when it is executed with justice, will pass on to wisdom. Therefore the Father will excel in wisdom all human and angelic wisdom, because He is Lord, and Judge, and the Just One, and Ruler over all. For He is good, and merciful, and patient, and saves whom He ought: nor does goodness desert Him in the exercise of justice, nor is His wisdom lessened; for He saves those whom He should save, and judges those worthy of judgment. Neither does He show Himself unmercifully just; for His goodness, no doubt, goes on before, and takes precedency.
Source: Adversus haereses (New Advent)