That Christ our God should come, the En-lightener and Saviour of the human race
In Isaiah: “Be comforted, you weakened hands; and you weak knees, be strengthened. You who are of a timorous heart, fear not. Our God will recompense judgment, He Himself will come, and will save us. Then shall be opened the eves of the blind, and the ears of the deaf shall hear. Then the lame man shall leap as a stag, and the tongue of the dumb shall be intelligible; because in the wilderness the water is broken forth, and the stream in the thirsty land.” Also in that place: Not an elder nor an angel, but the Lord Himself shall deliver them; because He shall love them, and shall spare them, and He Himself shall redeem them. Also in the same place: “I the Lord God have called You in righteousness, that I may hold Your hand, and I will comfort You; and I have given You for a covenant of my people, for a light of the nations; to open the eyes of the blind, to bring forth them that are bound from chains, and those who sit in darkness from the prison-house.
I am the Lord God, that is my name. I will not: give any glory to another, nor my powers to given images.” Also in the twenty-fourth Psalm: “Show me Your ways, Lord, and teach me Your paths, and lead me unto Your truth, and teach me; for You are the God of my salvation.” Whence, in the Gospel according to John, the Lord says: “I am the light of the world. He that will follow me shall not walk in darkness, but shall have the light of life.” Moreover, in that according to Matthew, the angel Gabriel says to Joseph: “Joseph, you son of David, fear not to take unto you Mary your wife.
For that which shall be born to her is of the Holy Ghost. And she shall bring forth a son, and you shall call His name Jesus; for He shall save His people from their sins.” Also in that according to Luke: “And Zacharias was filled with the Holy Ghost, and prophesied, saying, Blessed be the Lord God of Israel, who has foreseen redemption for His people, and has raised up an horn of salvation for us in the house of His servant David.” Also in the same. place, the angel said to the shepherds: “Fear not; for, behold, I bring you tidings that unto you is born this day in the city of David a Saviour, which is Christ Jesus.”
Source: The Treatises of Cyprian (New Advent)