The terms “unbegotten” and “begotten” are interchangeable with the terms Father and Son. This follows from the relation of a substantive to its adjective. In whatever sense a substantive is employed, in the same sense must the adjective formed from it be employed. Consequently, if the first person of the Trinity may be called Father in a sense that implies deity, he may be called Unbegotten in the same sense. And if the second person may be called Son in a sense implying deity, he may be called Begotten in the same sense. The Ancient church often employed the adjective, and spoke of God the Unbegotten and God the Begotten (Justin Martyr, Apol. i. 25, 53; ii. 12, 13. Clem. Alex. Stromata v. xii.). This phraseology sounds strange to the Modern church, yet the latter really says the same thing when it speaks of God the Father, and God the Son.—W.G.T.S.]