44 For as two advents of our Lord and Saviour are indicated in the Scriptures, the one being His first advent in the flesh, which took place without honour by reason of His being set at nought, as Isaiah spoke of Him aforetime, saying, “We saw Him, and He had no form nor comeliness, but His form was despised (and) rejected (lit. = deficient) above all men; a man smitten and familiar with bearing infirmity, (for His face was turned away); He was despised, and esteemed not.” But His second advent is announced as glorious, when He shall come from heaven with the host of angels, and the glory of His Father, as the prophet says, “You shall see the King in glory;” and, “I saw one like the Son of man coming with the clouds of heaven; and he came to the Ancient of days, and he was brought to Him.
And there were given Him dominion, and honour, and glory, and the kingdom; all tribes and languages shall serve Him: His dominion is an everlasting dominion, which shall not pass away.” Thus also two forerunners were indicated. The first was John the son of Zacharias, who appeared in all things a forerunner and herald of our Saviour, preaching of the heavenly light that had appeared in the world. He first fulfilled the course of forerunner, and that from his mother's womb, being conceived by Elisabeth, in order that to those, too, who are children from their mother's womb he might declare the new birth that was to take place for their sakes by the Holy Ghost and the Virgin.
Source: The Antichrist (New Advent)