The Nature of the Fallen Angels

5.1 The Nature of the Fallen Angels

In the beginning when God created the invisible world, the world of the angels, God created them good...

"The devil and the other demons were indeed created naturally good by God, but they became evil by their own doing." (Catechism of the Catholic Church, 391)

But there were those who rejected His eternal plan and rebelled against Him. They could not accept what He was planning to do.

"Scripture speaks of a sin of these angels. This “fall” consists in the free choice of these created spirits, who radically and irrevocably rejected God and his reign." (CCC 392)

Traditionally, this is the part of Scripture that describes the reason of the fall of a third of the angelic hosts:

"How you have fallen from heaven,
morning star, son of the dawn!
You have been cast down to the earth,
you who once laid low the nations!
You said in your heart,
‘I will ascend to the heavens;
I will raise my throne
above the stars of God;
I will sit enthroned on the mount of assembly,
on the utmost heights of Mount Zaphon.
I will ascend above the tops of the clouds;
I will make myself like the Most High.’
But you are brought down to the realm of the dead,
to the depths of the pit." (Isaiah 14:12-15).

Lucifer (the morning star, son of the dawn) desired to be god without God! He envied the prerogatives of God. (CCC 391)