The Great Desire of Every Nation

In Matthew's gospel, it is the major who are called to the infant Jesus. They see something, they have a portent in the heavens. The Carol of course got it from Isaiah, which speaks about God as the desire of nations. But I remember hearing Rowan Williams speak about the Magi one year at the House of Bishops Epiphany meeting. And he pointed out that the Magi saw enough of the revelation of God in the heavens to get them broadly to the right place, but they went to the wrong house and then it took scripture to get them from there to where Jesus was.