Why Jehovah is nowhere named in the Word of the New Testament, but the Lord instead

In the Word of the New Testament by the Evangelists, and in the Apocalypse, Jehovah is nowhere named, but for Jehovah it says Lord, and this for hidden reasons, of which presently. That the Word of the New Testament says Lord instead of Jehovah is very evident in Mark: “Jesus said, The first of all the commandments is, Hear, O Israel! the Lord our God is one Lord; therefore thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength” (xii. 29, 30).The same in Moses reads thus: “Hear, O Israel! Jehovah our God is one Jehovah, and thou shalt love Jehovah thy God with all thy heart, and with all thy soul, and with all thy strength” (Deut. vi. 4, 5).Here it is plain that the name Lord is used for Jehovah. So in John: “I saw, … and behold a throne was set in heaven, and one sat on the throne;…. and round about the throne were four animals, full of eyes before and behind; … each of them had six wings round about, and within full of eyes;….and they said, Holy, holy, holy, Lord God Almighty” (Apoc. iv. 2, 6, 8). This in Isaiah is thus expressed: “I saw the Lord sitting upon a throne high and lifted up; …. the seraphim standing above it; each one had six wings; … and one cried unto another, Holy, holy, holy, Jehovah of Hosts” (vi 1, 3, 5, 8). Here the name Lord is used for Jehovah, and Lord God Almighty for Jehovah of Hosts. That the four animals are seraphim or cherubim is plain from Ezekiel i. 5, 13-15, 19; x. 15. From many other passages also it appears that in the New Testament the Lord is Jehovah; as in Luke: “The angel of the Lord appeared to Zacharias” (i. 11). The angel of the Lord stands for the angel of Jehovah. In the same Evangelist the angel said to Zacharias concerning his son: “Many of the children of Israel shall he turn to the Lord their God” (i. 1 6 ); to the Lord their God, for to Jehovah God. Again: the angel said to Mary con­cerning Jesus: “He shall be great, and shall be called the Son of the Highest, and the Lord God shall give unto Him the throne of … David” (i. 32); the Lord God for Jehovah God. Again: “Mary said, My soul doth magnify the Lord, and my spirit hath rejoiced over God my Saviour” (i. 46, 47). Here also the Lord is put for Jehovah. Again: “Zacharias … prophesied, saying, Blessed be the Lord God of Israel” (i. 67, 68). Here the Lord God, for Jehovah God. Again: “The angel of the Lord stood near the shepherds, and the glory of the Lord shone round about them” (ii. 9). The angel of the Lord, and the glory of the Lord, for the angel of Jehovah, and the glory of Jehovah. In Matthew: “Blessed is He that cometh in the name of the Lord” (xxi. 9; xxiii. 39; Luke xiii. 35; John xii. 13). In the name of the Lord, for in the name of Jehovah. There are also, many other passages, as Luke i. 28; 15,22-24, ’29, 38, 39; v. 17; Mark xii. 10, 11. Among the hidden reasons why they called Jehovah Lord were also these: because if it had been declared at that time that the Lord was the Jehovah so often mentioned in the Old Testament, it would not have been received, for it would not have been believed; and because the Lord was not made Jehovah even as to His Human until He had entirely united the Divine Essence to the Human, and the Human to the Divine. The plenary unition was effected after the last temptation, which was that of the cross; wherefore, after the resurrection, the disciples always called Him Lord (John xx. 2, 13, 15, 18, 20, 25; xxi. 7, 12, 15-17, 20; Mark xvi. 19, 20); and Thomas said, “My Lord and my God” (John xx. 28). And because the Lord was Jehovah, who is so often mentioned in the Old Testament, therefore also He said to the disciples, “Ye call Me Master and Lord, and ye say well; for I am” (John xiii. 13, 14, 16); by which words it is signified that He was Jehovah God…. That the Lord was Jehovah is meant also by the words of the angel to the shepherds: “Unto you is born this day … a Saviour, who is Christ the Lord” (Luke ii. 11); Christ is put for the Messiah, the Anointed, the King, and Lord for Jehovah. They who examine the Word with­out much attention cannot know this, believing that our Saviour, like others, was called Lord merely from a common form of expressing reverence; but He was so called because He was Jehovah. (AC n. 2921)

That Jehovah in thee Old Testament is called the Lord in the New appears from these passages: It is said in Moses, “Hear, O Israel! Jehovah our God is one Jehovah; and thou shalt love Jehovah thy God with all thy heart and with all thy soul” (Deut. vi. 4, 5); but in Mark: “The Lord our God is one Lord; and thou shalt love the Lord thy God with all thy heart and with all thy soul” (xii. 29, 30). Then in Isaiah: “Prepare ye the way for Jehovah; make straight in the desert a path for our God” (xl. 3); but in Luke: “Thou shalt go before the face of the Lord, to prepare the way for Him” (i. 76); and elsewhere. And also the Lord commanded His disciples to call Him Lord; and therefore He was so called by the Apostles in their Epistles; and afterwards by the Apostolic Church, as appears from its creed, which is called the Apostles’ Creed. The reason was that the Jews did not dare to speak the name Jehovah, on account of its sanctity; and also that by Jehovah is meant the Divine Esse, which was from eternity, and the Human which He assumed in time was not that Esse. (TCR n. 81)