A church cannot serve two masters. It cannot peacefully coexist with truths and falsities. To want to live with both and to seek a compromise will cause the church to be laid to waste. The church will perish, and the goods and truths of the Word will be taken away from it.

Plants in general stand for facts and ideas, so it makes sense that a forest in the Bible represents a collection or system of external, factual, ideas. This can be a collection on its own, or it can be the collected external knowledge of a church. It can also represent the level of a person's mind where he or she deals with such systems of ideas.

(Referencias: Arcana Coelestia 9011 [1,3-7], 9642 [3,23]; The Apocalypse Explained 650 [26,49])