We read in John,
In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through him, and nothing that was made came about without him. In him there was life, and that life was the light for humankind. And the light shines in the darkness, but the darkness did not grasp it. And the Word became flesh and lived among us; and we saw his glory, glory like that of the only-begotten child of the Father. He was Full of grace and truth. (John 1:1,2,3,4,5,14)
In the same Gospel,
Light has come into the world, but people loved darkness rather than light, because their deeds were evil. (John 3:19)
And elsewhere in the same Gospel,
While you have the light, believe in the light, so that you may become children of the light. I have come into the world as a light so that anyone who believes in me will not remain in darkness. (John 12:36,46)
We can see from this that the Lord is God from eternity and that he himself is that Lord who was born into the world. It actually says that the Word was with God and that the Word was God, as well as that nothing that was made came about without him, and then that the Word became flesh and that they saw him.
There is little understanding in the church of what it means to call the Lord “the Word.” He is called the Word because the Word means divine truth or divine wisdom and the Lord is divine truth itself or divine wisdom itself. That is why he is also called the light that is said to have come into the world.
Since divine wisdom and divine love are one with each other and have been one in the Lord from eternity, it also says “in him there was life, and that life was the light for humankind.” The life is divine love, and the light is divine wisdom.
from The Lord, Section 1