Thus God is wholly good, because in all things He is on the side of good. His omnipotence is ultimately revealed as He displays both his ability to save and to punish. . . I would question his ability to deal with humans if he were only able to do one, but not the other. And thus even the display of God’s justice reveals the fullness of the divinity himself, showing him as the perfect Father and the perfect Master: he is a father in his mercy, a Master in his discipline; a Father in kindly authority, a Master in his severity; a Father who is loved affectionately, a Master to be feared. He is loved because he loves mercy more than sacrifice, but he is feared because he hates sin. He is loved because he prefers a sinners repentance rather than his death, but he is feared because he rejects those who don’t repent.
Tertullian, Against Marcion 2.13 (ANF 3, 308, updated)