7 “John bears witness of Him, and cries, saying, This was He of whom I spoke, He that comes after me is made before me.” He came after me, and He preceded me. What is it, “He is made before me”? He preceded me. Not was made before I was made, but was preferred before me, this is “He was made before me.” Wherefore was He made before you, when He came after you? “Because He was before me.” Before you, O John! What great thing to be before you! It is well that you bear witness to Him; let us, however, hear Himself saying, “Even before Abraham, I am.” But Abraham also was born in the midst of the human race: there were many before him, many after him.
Listen to the voice of the Father to the Son: “Before Lucifer I have begotten You.” He who was begotten before Lucifer Himself illuminates all. A certain one was named Lucifer, who fell; for he was an angel and became a devil; and concerning him the Scripture said, “Lucifer, who did arise in the morning, fell.” And why was he Lucifer? Because, being enlightened, he gave forth light. But for what reason did he become dark! Because he abode not in the truth. Therefore He was before Lucifer, before every one that is enlightened; since before every one that is enlightened, of necessity He must be by whom all are enlightened who can be enlightened.
Source: Tractates on the Gospel of John (New Advent)