Fifth step:

Beings travel between Earth and the heavens and important necessities for the former are sent from the latter. Given that pure spirits travel to the heavens evil spirits attempt to do likewise as they are physically light and subtle. But they are driven off for they are by nature evil and unclean. The wisdom of Divine Lordship's sovereignty requires a sign or reflection of this important interaction and contest in the visible material world for conscious beings. This is particularly so for humanity whose most important duty is observing witnessing supervising and acting as a herald to His significant disposals in the Unseen realm.

He has made rain a sign for us to explain in physical terms. His countless miracles in spring. He has made apparent (natural) causes point to His art's wonders so that He may attract the attentive gaze of the inhabitants of the heavens and Earth to witness that amazing exhibition. He displays the vast heavens as a castle a city arrayed with towers on which sentries are posted so that the inhabitants of the heavens and Earth may reflect on His Lordship's majesty.

Since wisdom requires the announcement of this elevated contest there will be a sign for it. Accordingly other than some stars used as "missiles" for the devils no atmospheric or "heavenly" event seems appropriate to this announcement. This is just the case with stellar events. They are considered suitable for repulsing devils for they resemble missiles and signal rockets fired from the formidable bastions of high castles and unlike other "heavenly" events no other function is known for such events. Moreover this function has been widely known since the time of Adam and witnessed by those who know the reality of things and events.