Tertullian, Against Marcion 2.17

Disregarding these facts reveals the entire order of God the Judge and, to put it more worthily, the guardian of that catholic and supreme goodness which the Marcionites refuse to recognize in the same God — a goodness kept pure and separate from judicial categories — because he rains on the good and the evil and makes his sun rise on the just and the unjust (Matt 5:45), something another god altogether fails to provide. Even if Marcion dared to cut this testimony of Christ about the Creator out of the Gospel, the world itself is written with it, and every conscience reads it. This patience of the Creator will stand in judgment against Marcion — the patience that waits for the sinner's repentance rather than death and prefers mercy to sacrifice, turning aside the doom decreed for the Ninevites (Jonah 3:4-10), granting Hezekiah an extension of life through his tears (2 Kings 20:1-6), and restoring the Babylonian tyrant's kingdom after he repented. I mean that mercy which also let Saul's son die out of devotion to the people, and freed David from his guilt — confessed in Uriah's house — with full pardon, and restored Israel as often as it judged it, as often as it comforted it even while rebuking it.