The concept of "sacred" or "holy" names for the Lord God originates in Talmudic Judaism; it is a mystical concept which is not Christian.
Mysticism plays a large role in Talmudism, which is to say, Talmudic Judaism. Some suppose that the efficacy of prayer and praise depends upon correct pronunciation of the so-called "sacred name". And one legend has it that the Talmudic Jew considered the "sacred name" too sacred to pronounce or write, so he substituted the term "Adonai", which supposedly has the same Ancient Hebrew consonants as does the "sacred name". But the concept of a name too sacred to pronounce or write is absurd; and the legend fails to explain how knowledge of a name too sacred to pronounce or write was transmitted from one generation of Israelite to the next.
There is no general agreement as to the spelling or pronunciation of the sacred name, and opinion changes from one generation to the next and from one ethnicity to another. Just within the English-speaking populace of the world, there have been numerous variants of spelling and pronunciation. At one time, "Jehovah" was in vogue; more recently, the fashion is for "Yahweh". "Yahoo" is another of the many variants.
But all such variants have to do with the Hebrew language, which today survives only in the form of the Masoretic Hebrew Text, which is a forgery of the Ancient Hebrew Text. Today there is no extant manuscript of Scripture written in Ancient Hebrew; all Scripture which has survived to the present day is written in the Koine dialect of Greek.
The portion of the Scripture which the Protestant erroneously calls the "Old Testament" has been preserved in a translation known as the Septuagint, which also is called by the Roman numerals "LXX" meaning "Seventy". The translation was made a century or more in advance of the birth of Christ Jesus. The Ancient Hebrew Text appears to have perished in the A.D. 70 destruction of Jerusalem. The Masoretic Hebrew Text, from which the "Old Testament" of virtually every English Bible has been translated, did not make its appearance until the Fifteenth Century of the present Christian era.
When Jesus and the Apostles cite the Scripture, their citations typically agree with the reading of the Septuagint and typically disagree with the reading of the Masoretic Hebrew Text. Thus, the citations of Jesus and the Apostles (1) authenticate the Septuagint as the official Canon of Scripture and (2) demonstrate the Masoretic Hebrew Text to be forgery and counterfeit of the Ancient Hebrew Text.
Obviously, the so-called "sacred name", being Hebrew, does not appear in the Greek text of the Septuagint. The Scripture has many descriptive names for the Lord, one example being "the Many-Breasted One", which speaks of the ability of the Lord to provide nourishment for his own, even as a mother provides nourishment for her babe. Another descriptive term is "I Am that I Am", which has the connotation, "the Self-Existing One". But a descriptive name is not a mystical name. The notion that the Lord God has a "sacred name" appears to be without basis.
As to the knowledge of the Incarnate Christ regarding the "sacred name": In order to become a man, Jesus laid aside the attributes of deity, Philippians 2:5-8; the implications are staggering, and are ill-appreciated by the Protestant. The incarnate Christ Jesus was not omniscient; it was through study of the Scripture, with the enlightenment of the Spirit of God, that Jesus learned of his own identity as the Word which became flesh, John 1:14. The Protestant concept of Hypostatic Union is not taught by the Scripture. When Jesus prayed to the Lord God, he addressed him as "Father", as recorded in the account of John chapter 17; this is in keeping with the traditional form of address by a child to his father.
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