“Many exegetes have thought about these three gifts, some explaining them in one way, the others in another, but generally they are agreed that they represent three difficult confessions. Of these explanations we will choose those which seem best to us at present. The sacrifice of gold, it is said, signifies their confession that Christ is a king, the frankincense, that he is priest, the myrrh, that he died and was buried. These three aspects, it is said, apply to the humanity of Christ, but in such a way, that he is God and that all this happened to his humanity because of his divinity.” (p. 278)
Luther, Martin. “The Gospel for the Festival of the Epiphany, Matthew 2:1-12” from his Christmas Postil, Luther’s Works Vol. 52. Philadelphia: Fortress Press, 1974, p. 278.