Revelation 12:3

And there appeared... — Better, And another sign was seen in the heaven; and behold a great red dragon. This, too, is a sign, and has a meaning. The dragon stands for some dread and hostile power. “The dragon is that fabulous monster of whom ancient poets told, as large in size, coiled like a snake, blood red in colour... insatiable in voracity, and ever athirst for human blood” — a fit emblem of him whom our Lord declared to be a murderer from the beginning; for the dragon is intended here to describe him who, in Revelation 12:9, is also said to be that old serpent, called the Devil and Satan. The red colour is the colour of flame and blood, and the symbol of destruction and slaughter. The dragon is the emblem of the evil spirit, the devil, the perpetual antagonist of good, the persecutor of the Church in all ages (comp. Psalms 74:13): just as the dragon is sometimes employed to represent the Egyptian power, the ancient foe of Israel (Isaiah 51:9; Ezekiel 29:3).

Having seven heads and ten horns, and seven crowns (diadems) upon his heads. — This is the further description of the dragon. He is one, yet diverse; one, as an evil spirit; diverse, in the varieties of his power. The woman is hut one: but her foe is multiform; she has one trust to keep, one work to do, and can but fulfil it in her Master’s way: evil is bound by no law, regards no scruple, and exerts its power through any channel and by every means. Is there not also an assumption of divine similitude here in the use of the number seven? It is at least the representation of the great and world-wide power which he exercises as the prince of this world, whose kingdom is in much a parody of the true kingdom. The whole description should be compared with the account given of the beast in Revelation 17:3; Revelation 17:7; Revelation 17:10; Revelation 17:12. There the seven heads are explained as seven kings, and the heads here are crowned; the ten horns are also explained as ten kings. The sevenfold kingship and the tenfold power of the world are thus described as belonging to the dragon. The picture here, as the picture of the wild beast in Revelation 17, represents, as concentrated into a single hostile form, all the varying forces and successive empires which have opposed or oppressed the people of God, and sought to destroy their efforts for good: for all evil has its root in a spirit at enmity with God. Hence the dragon appears armed with all the insignia of those sovereignties and powers which have been animated by this spirit.