Scripture and the Church’s Tradition see in this
being a fallen angel, called “Satan” or the “devil”. [267] The Church teaches that Satan was at first
a good angel, made by God: “The devil and the other demons were indeed created naturally good
by God, but they became evil by their own doing.” [268]
392 Scripture speaks of a sin of these angels. [269] This “fall” consists in the free choice of these
created spirits, who radically and irrevocably rejected God and his reign. We find a reflection of
that rebellion in the tempter’s words to our first parents: “You will be like God.” [270] The devil “has
sinned from the beginning”; he is “a liar and the father of lies”. [271]
393 It is the irrevocable character of their choice, and not a defect in the infinite divine mercy, that
makes the angels’ sin unforgivable. “There is no repentance for the angels after their fall, just as
there is no repentance for men after death.” [272]
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. [273]
“The reason the Son of God appeared was to destroy the works of the devil.” [274] In its
consequences the gravest of these works was the mendacious seduction that led man to disobey
God.
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.” [275]