The Demonstration Of The Apostolic Preaching

And that this Christ, who was with the Father, being the Word of the Father, was thereafter to be made flesh and become man and undergo the process of birth and be born of a virgin and dwell among men, the Father of all bringing about His incarnation [191] -- Isaiah says thus:

Therefore the Lord himself shall give you a sign: behold, the virgin shall conceive and shall bring forth a son, and ye shall call him Emmanuel: butter and honey shall he eat; before he knoweth or selecteth the evil, he chooseth the good: for, before the child knoweth good or evil, he rejecteth wickedness to choose the good.
So he proclaimed His birth from a virgin; and that He was truly man he declared beforehand by His eating; and also because he called Him the child; and further by giving Him a name; for this is the custom also for one that is born. [192] And His name is two-fold: in the Hebrew tongue Messiah Jesus, and in ours Christ Saviour. And the two names are names of works actually wrought. For He was named Christ, because through Him the Father anointed and adorned all things; and because on His coming as man He was anointed with the Spirit of God and His Father. As also by Isaiah He says of Himself:

The Spirit of the Lord is upon me: wherefore he hath anointed me to preach good tidings to the poor. And (He was named) Saviour for this, that He became the cause of salvation to those who at that time were delivered by Him from all sicknesses and from death, [193] and to those who afterwards believed on Him the author of salvation in the future and for evermore.