733. Verses 7, 8. And there was war in heaven, Michael and his angels fought with the dragon, and the dragon fought and his angels. And they prevailed not, and their place was not found anymore in heaven.

7. "And there was war in heaven," signifies the combat of falsity against truth, and of truth against falsity n. 734; "Michael and his angels fought with the dragon, and the dragon fought and his angels," signifies the combat between those who are for the life of love and charity and for the Divine of the Lord in His Human against those who are for faith alone or faith separate, and are against the Divine of the Lord in His Human n. 735.

8. "And they prevailed not, and their place was not found anymore in heaven," signifies that they were overcome, and that nowhere in the heavens henceforth is there a place that corresponds to the state of their life, which is a state of thought alone, and of no affection of good and truth (n. 736, 737).

The 'Harvest,' as mentioned in Mark 4:29, signifies the increase of the church in general and particular.

In Joel 3:13, it signifies the last state of the church before it has been devastated from all good and truth.

'A harvest' symbolizes the state of the church with respect to Divine truth. The reason is that a harvest yields the grain used to make bread, and grain and bread symbolize the church's goodness, which is achieved through truths.

(Odkazy: Apocalypse Revealed 645; Joel 3; Mark 4)