5. We have an account of the light by which the prophet saw these living creatures, or the looking-glass in which he saw them, v. 13. (1.) He saw them by their own light, for their appearance was like burning coals of fire; they are seraphim-burners, denoting the ardour of their love to God, their fervent zeal in his service, their splendour and brightness, and their terror against God's enemies. When God employs them to fight his battles they are as coals of fire (Ps. xviii. 12) to devour the adversaries, as lightnings shot out to discomfit them. (2.) He saw them by the light of some lamps, which went up and down among them, the shining whereof was very bright. Satan's works are works of darkness; he is the ruler of the darkness of this world. But the angels of light are in the light, and, though they conceal their working, they show their work, for it will bear the light. But we see them and their works only by candle-light, but the dim light of lamps that go up and down among them; when the day breaks, and the shadows flee away, we shall see them clearly. Some make the appearance of these burning coals, and of the lightning that issues out of the fire, to signify the wrath of God, and his judgments, that were now to be executed upon Judah and Jerusalem for their sins, in which angels were to be employed; and accordingly we find afterwards coals of fire scattered upon the city to consume it, which were fetched from between the cherubim, ch. x. 2. But by the appearance of the lamps then we may understand the light of comfort which shone forth to the people of God in the darkness of this present trouble. If the ministry of the angels is as a consuming fire to God's enemies, it is as a rejoicing light to his own children. To the one this fire is bright, it is very reviving and refreshing; to the other, out of the fire comes fresh lightning to destroy them. Note, Good angels are our friends, or enemies, according as God is.