John Wesley on Revelation 9:13

And the sixth angel sounded - Under this angel goes forth the second woe. And I heard a voice from the four corners of the golden altar - This golden altar is the heavenly pattern of the Levitical altar of incense. This voice signified that the execution of the wrath of God, mentioned verses 20, 21, Rev 9:20,21 should, at no intercession, be delayed any longer.