“Then the LORD spoke his word to Zechariah. He said, ‘This is what the LORD of Armies says: Administer real justice, and be compassionate and kind to each other. Don't oppress widows, orphans, foreigners, and poor people. And don't even think of doing evil to each other.” (Zechariah 7:8-10) “Here is my servant whom I have chosen, the one I love, in whom I delight; I will put my Spirit on him, and he will proclaim justice to the nations. He will not quarrel or cry out; no one will hear his voice in the streets. A bruised reed he will not break, and a smoldering wick he will not snuff out, till he leads justice to victory.” (Matthew 12:18-20 – NIV)
Christ saves men, who have fallen through their own fault into the power of the devil, by breaking that power. He became Man for this purpose; He lived and died and rose again that He might break the chains by which men were bound. It is not His death alone, but the entire Incarnation, of which His death was a necessary part, that freed men from their captivity to Satan. By becoming Man, living a sinless life, and rising from the dead (which He could not have done unless He had first died), He introduced a new power into human nature. This power is bestowed on all men who are willing to receive it, through the Holy Spirit. Those who receive it are united with Christ in His Mystical Body, the Church; the corrupted human nature (the bad habits and evil desires, which St Paul calls "the old man": Rm.6:6; Eph.4: 22; Col.3:9) is driven out by degrees, until at last it is expelled altogether, and the redeemed person becomes entirely obedient to the will of God, as our Lord Himself was when on earth. The prisoner is set free from the inside; his mind and body are both changed; he comes to know what freedom is, to desire it and, by the Holy Spirit working within him, to break his chains, turn the key and leave the dungeon. Thus, he is freed from the power of sin. God forgives him, as an act of pure love; but the condition of his forgiveness is that he must sin no more. "While we were yet sinners Christ died for us" (Rm.5:8-9) but, if we continue to be sinners, Christ's death for us will have been in vain; and we are made capable of ceasing to be sinners by the power of Christ's Resurrection, which has given us the power to struggle against sinfulness, toward moral perfection.