Eternal

Is not eternal one of the attributes of the Godhead? In truest harmony with His Godhead qualities, and coequal with, and acting together with the Father and the Son, He is called "the Spirit of truth, which proceedeth from the Father," and also "the Spirit of His Son" Cohn 15:26; Gal. 4:6). Besides, the Spirit is constantly called holy which is a term emphatically applied to God: "I am holy" (I Peter 1:16).
Again we read in 2 Peter 1:21 concerning the Old Testament scriptures that "holy men of God spake as they were moved by the Holy Ghost." Paul also declared, "Well spake the Holy Ghost by Esaias the prophet." and yet we are told that it was "the Lord God of Israel" who "spake by the mouth of His holy prophets." In Isaiah it says that it was the Lord (Adonahy, Lord in plurality of persons) who gave him the word to say. Is it possible to have clearer testimony to the Godhead of the Holy Spirit?