John Chrysostom
Catena Aurea · Lukasevangelium 1
And there appeared unto him an angel of the the Lord standing on the right side of the altar of incense. And when Zacharias saw him, he was troubled, and fear fell upon him. But the angel said unto him, Fear not, Zacharias: for thy prayer is heard; and thy wife Elisabeth shall bear thee a son, and thou shalt call his name John. And thou shalt have joy and gladness; and many shall rejoice at his birth.
(de Inc. Dei Nat.) The justest of men can not without fear behold an angel; Zacharias therefore, not sustaining the sight of the angel’s presence, nor able to withstand his brightness, is troubled, as it is added, Zacharias was troubled. But as it happens, when a charioteer is frightened, and has let loose his reins, the horses run headlong, and the chariot is overturned; so is it with the soul, when it is taken by any surprise or alarm; as it is here added, and fear fell upon him.