1Jn 3, 8-10 No one who is begotten by God commits sin

(1Jn 3, 8-10) No one who is begotten by God commits sin
[8] Whoever sins belongs to the devil, because the devil has sinned from the beginning. Indeed, the Son of God was revealed to destroy the works of the devil. [9] No one who is begotten by God commits sin, because God's seed remains in him; he cannot sin because he is begotten by God. [10] In this way, the children of God and the children of the devil are made plain; no one who fails to act in righteousness belongs to God, nor anyone who does not love his brother.

(CCC 413) "God did not make death, and he does not delight in the death of the living…. It was through the devil's envy that death entered the world" (Wis 1:13; 2:24). (CCC 414) Satan or the devil and the other demons are fallen angels who have freely refused to serve God and his plan. Their choice against God is definitive. They try to associate man in their revolt against God. (CCC 394) Scripture witnesses to the disastrous influence of the one Jesus calls "a murderer from the beginning", who would even try to divert Jesus from the mission received from his Father (Jn 8:44; cf. Mt 4:1-11). "The reason the Son of God appeared was to destroy the works of the devil” (I Jn 3:8). In its consequences the gravest of these works was the mendacious seduction that led man to disobey God. (CCC 395) The power of Satan is, nonetheless, not infinite. He is only a creature, powerful from the fact that he is pure spirit, but still a creature. He cannot prevent the building up of God's reign. Although Satan may act in the world out of hatred for God and his kingdom in Christ Jesus, and although his action may cause grave injuries - of a spiritual nature and, indirectly, even of a physical nature - to each man and to society, the action is permitted by divine providence which with strength and gentleness guides human and cosmic history. It is a great mystery that providence should permit diabolical activity, but "we know that in everything God works for good with those who love him” (Rom 8:28).