Revelation 9 - G. Campbell Morgan's Exposition on the Whole Bible

At the sounding of the fifth trumpet the procedure of judgment takes a new form, passing from the material to the spiritual. The loosing of Satan is suggestive of the manifestation of satanic agency under the permission of God. Demons come forth, a terrible army, and scatter among the sons of men. It is noticeable that their power and time are limited by the government of God. The most terrible aspect of this visitation is that stricken men seek for death and are not able to find it.

The sounding of the sixth trumpet introduces a period of judgment in more terrible forms. Immense hosts of hitherto restrained powers of darkness sweep over the earth. The worship of demons is clearly mentioned in this connection as one of the manifestations of evil. The unholy traffic with the spirit world will issue in the devastation of men by these very spiritual agencies.

The closing declaration here is indeed terrible. Notwithstanding the awful dispensation of death, men unsmitten will not repent, but will continue in the same demon worship, with its consequent sins of murder, sorcery, and fornication.