Andrew of Caesarea
By the morning star He means either the one of whom the prophet Isaiah proclaims, "How you have fallen from heaven, O morning star, rising at dawn." He promises, after crushing him, to place him beneath the feet of the faithful (Lk 10:18-19; Ps 90).
Or He means the daystar mentioned by blessed Peter, shining clearly in the hearts of believers (2 Pet 1:19), that is, the illumination of Christ.
John the Baptist and Elijah the Tishbite are also commonly called daystars. The former was the forerunner of the first rising of the Sun of righteousness, and the latter the forerunner of His second coming. We believe that those who overcome the devil will share with them.
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There is nothing surprising in the fact that things so opposed to one another are called by one and the same name. We know from Holy Scripture that, under the name of lion, interpreted in different senses, both Christ, the Lion of Judah, and the devil, the lion from Bashan, are understood.
Likewise, by the east one may understand the beginning of the coming day, with which the darkness of the present life will be dispersed. One may also understand the angel who announces this day, for he precedes Christ, the Sun of righteousness, who enlightens the faithful and disperses the gloom of the present life.