Augustine of Hippo, “On the Trinity,” in St. Augustin: On the Holy Trinity, Doctrinal Treatises, Moral Treatises, ed. Philip Schaff, trans. Arthur West Haddan, vol. 3, A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, First Series (Buffalo, NY: Christian Literature Company, 1887), 177.
And righteousness was therefore made more acceptable in humility, because so great power as was in His Divinity, if He had been unwilling, would have been able not to suffer humility; and thus by Him who died, being thus powerful, both righteousness was commended, and power promised, to us, weak mortals. For He did one of these two things by dying, the other by rising again. For what is more righteous, than to come even to the death of the cross for righteousness? And what more powerful, than to rise from the dead, and to ascend into heaven with that very flesh in which He was slain? And therefore He conquered the devil first by righteousness, and afterwards by power: namely, by righteousness, because He had no sin, and was slain by him most unjustly; but by power, because having been dead He lived again, never afterwards to die. But He would have conquered the devil by power, even though He could not have been slain by him: although it belongs to a greater power to conquer death itself also by rising again, than to avoid it by living. But the reason is really a different one, why we are justified in the blood of Christ, when we are rescued from the power of the devil through the remission of sins: it pertains to this, that the devil is conquered by Christ by righteousness, not by power. For Christ was crucified, not through immortal power, but through the weakness which He took upon Him in mortal flesh; of which weakness nevertheless the apostle says, ‘that the weakness of God is stronger than men.’