He writes about this in all his letters. Some things in Paul’s letters are hard to understand, and people who are ignorant and weak in faith explain these things falsely. They also falsely explain the other Scriptures, but they are destroying themselves by doing this.
These enemies of Christ were in our fellowship, but they left us. They never really belonged to us; if they had been a part of us, they would have stayed with us. But they left, and this shows that none of them really belonged to us.
The giant dragon was thrown down out of heaven. (He is that old snake called the devil or Satan, who tricks the whole world.) The dragon with his angels was thrown down to the earth.