Two things constitute the essence of God: divine love and divine wisdom; or, what is the same, divine goodness and divine truth. (Above at Sections 36–48 we showed that these two constitute the essence of God.) The expression “Jehovah God” in the Word means these two qualities. “Jehovah” means divine love or divine goodness; “God” means divine wisdom or divine truth. This is why these names occur in various ways in the Word. At times just Jehovah is named; at other times, just God. When the subject is divine goodness he is called Jehovah. When the subject is divine truth he is called God. When both are involved he is called Jehovah God.
It is clear from John that Jehovah God came down as divine truth, which is the Word:
In the beginning was the Word, and the Word was with God, and the Word was God. All things were made by it, and nothing that was made came about without it. And the Word became flesh and lived among us. (John 1:1, 3, 14)
“The Word” in this passage means divine truth because the Word that exists in the church is divine truth itself. The Word was dictated by Jehovah himself, and what Jehovah dictates is pure divine truth—it cannot be anything else. Nevertheless, because it passed all the way through the heavens into the world, it became adapted to angels in heaven and also to people in the world. As a result, in the Word there is a spiritual meaning in which divine truth is in the light and there is an earthly meaning in which divine truth is in shadow. The divine truth in this Word is what was meant in John.
This is clearer still from the fact that the Lord came into the world to fulfill all the things in the Word. This is why it says many times that this or that happened to him in order to fulfill Scripture [see Section 262]. Divine truth is precisely what “the Messiah” and “Christ” mean, what “the Son of Humankind” means, and what “the Comforter, the Holy Spirit” that the Lord sent after his death means. During his transfiguration on the mountain before his three disciples (Matthew 17[:1–13]; Mark 9[:2–13]; Luke 9[:28–36]) and also during his transfiguration before John in Revelation 1:12–16, the Lord represented himself as the Word, as we will see in the chapter below on Sacred Scripture [Section 222].
From the Lord’s own words it is clear that he was present in the world as divine truth: “I am the way, the truth, and the life” (John 14:6). This is also clear from these words:
“We know that the Son of God came and gave us understanding so that we would know the truth. And we are in the truth in the Son of God, Jesus Christ. He is the true God and eternal life” (1 John 5:20).
This becomes still clearer from the fact that he is called the light, as in these passages:
He was the true light that enlightens everyone who comes into the world. (John 1:9)
Jesus said, “For a brief time the light is still with you. Walk while you have the light so the darkness will not overtake you. While you have the light, believe in the light so that you may become children of the light.” (John 12:35, 36)
I am the light of the world. (John 9:5)
Simeon said, “My eyes have seen your salvation, a light of revelation to the nations.” (Luke 2:30, 32)
This is the judgment, that the light has come into the world. Those who do the truth come toward the light. (John 3:19, 21)
There are other such passages as well. “The light” means divine truth.
from True Christianity, Section 85