II. Both Herod and the wise men originally had an earthly conception of the kingdom signified; but the latter learned the truth, the former did not
But although it was the office of the Divine condescension to make the Saviour's Nativity recognizable to the nations, yet for the understanding of the wondrous sign the wise men could have had intimation even from the ancient prophecies of Balaam, knowing that it was predicted of old and by constant repetition spread abroad: “A star shall rise out of Jacob, and a man shall rise out of Israel, and shall rule the nations.” And so the three men aroused by God through the shining of a strange star, follow the guidance of its twinkling light, thinking they will find the babe designated at Jerusalem in the royal city.
But finding themselves mistaken in this opinion, through the scribes and teachers of the Jews they learned what the Holy Scripture had foretold of the birth of Christ; so that confirmed by a twofold witness, they sought with still more eager faith Him whom both the brightness of the star and the sure word of prophecy revealed. And when the Divine oracle was proclaimed through the chief priests' answers and the Spirit's voice declared, which says: “And you, Bethlehem, the land of Judah, are not least among the princes of Judah; for out of you shall come a leader to rule My people Israel,” how easy and how natural it was that the leading men among the Hebrews should believe what they taught!
But it appears that they held material notions with Herod, and reckoned Christ's kingdom as on the same level as the powers of this world: so that they hoped for a temporal leader while he dreaded an earthly rival. The fear that racks you, Herod, is wasted; in vain do you try to vent your rage on the infant you suspect. Your realm cannot hold Christ; the Lord of the world is not satisfied with the narrow limits of your sway. He, whom you do not wish to reign in Judæa, reigns everywhere: and you would rule more happily yourself, if you were to submit to His command.
Why do you not do with sincerity what in treacherous falseness you promise? Come with the wise men, and in suppliant adoration worship the true King. But you, from too great fondness for Jewish blindness, will not imitate the nations' faith, and directest your stubborn heart to cruel wiles, though you are doomed neither to stay Him whom you fear nor to harm them whom you slay.
Source: Sermons (New Advent)