I answer that, As knowledge is imparted through a syllogism from something which we know better, so knowledge given by signs must be conveyed through things which are familiar to those to whom the knowledge is imparted. Now, it is clear that the righteous have, through the spirit of prophecy, a certain familiarity with the interior instinct of the Holy Ghost, and are wont to be taught thereby, without the guidance of sensible signs. Whereas others, occupied with material things, are led through the domain of the senses to that of the intellect. The Jews, however, were accustomed to receive Divine answers through the angels; through whom they also received the Law, according to Acts 7:53: "You [Vulg.: 'who'] . . . have received the Law by the disposition of angels." And the Gentiles, especially astrologers, were wont to observe the course of the stars. And therefore Christ's birth was made known to the righteous, viz. Simeon and Anna, by the interior instinct of the Holy Ghost, according to Lk. 2:26: "He had received an answer from the Holy Ghost that he should not see death before he had seen the Christ of the Lord." But to the shepherds and Magi, as being occupied with material things, Christ's birth was made known by means of visible apparitions. And since this birth was not only earthly, but also, in a way, heavenly, to both (shepherds and Magi) it is revealed through heavenly signs: for, as Augustine says in a sermon on the Epiphany (cciv): "The angels inhabit, and the stars adorn, the heavens: by both, therefore, do the 'heavens show forth the glory of God.'" Moreover, it was not without reason that Christ's birth was made known, by means of angels, to the shepherds, who, being Jews, were accustomed to frequent apparitions of the angels: whereas it was revealed by means of a star to the Magi, who were wont to consider the heavenly bodies. Because, as Chrysostom says (Hom. vi in Matth.): "Our Lord deigned to call them through things to which they were accustomed." There is also another reason. For, as Gregory says (Hom. x in Evang.): "To the Jews, as rational beings, it was fitting that a rational animal [*Cf. FP, Question [51], Article [1], ad 2]," viz. an angel, "should preach. Whereas the Gentiles, who were unable to come to the knowledge of God through the reason, were led to God, not by words, but by signs. And as our Lord, when He was able to speak, was announced by heralds who spoke, so before He could speak He was manifested by speechless elements." Again, there is yet another reason. For, as Augustine [*Pope Leo] says in a sermon on the Epiphany: "To Abraham was promised an innumerable progeny, begotten, not of carnal propagation, but of the fruitfulness of faith. For this reason it is compared to the multitude of stars; that a heavenly progeny might be hoped for." Wherefore the Gentiles, "who are thus designated by the stars, are by the rising of a new star stimulated" to seek Christ, through whom they are made the seed of Abraham.