Daily Walk in the Catechism

287. What kind of a being is Satan?

He is God's enemy, the evil one, who was originally a holy angel but led a rebellion against God and remains opposed to God and all that is good.

Isaiah 14:12-15

2 Corinthians 11:14 Even Satan disguises himself as an angel of light.

1 Peter 5:8 Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour.

Revelation 12:9 And the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world--he was thrown down to the earth, and his angels were thrown down with him.

Read Matthew 13:24-30, 38-39, a parable about how Satan seeks to work evil in the Church.

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