This is a key moment in this story. The beginning of John 1 explained that the Lord is perfect, infinite love which gave itself expression as divine truth. The duality of love and expression formed a template for humanity, which meant that the Lord’s duality made him the ultimate, divine human. It showed that the divine truth was the power of creation, and that the Lord shared that truth with humanity from the outset, so that people could receive His love and return it. But people kept turning away, and the Lord had to keep expressing his love in more and more external forms to maintain a connection.

By mentioning John the Baptist, the chapter showed that the Jews of the time still had the truth – the Lord’s Word – contained inside the rough-hewn images of the Old Testament. But they were so steeped in evil loves and false thinking that the connection to the Word – to the love within the Old Testament – was about to be snipped forever.

So the Word became flesh. The Lord passed the full expression of His love and His full humanity into physical flesh as Jesus. That way He could once again show the life within the existing Scriptures and could make His own life and His own words part of an expanded expression of truth for a new age of humanity. People could no longer see and feel the Lord’s love through the Old Testament, but they could see and feel it in the face and hands and words of Jesus.

The "glory" here expresses the blinding brilliance of that truth. The "Father" represents the Lord’s actual love itself, and being "begotten" means that the love was expressed in the form of truth. Being full of "truth" has a pretty obvious meaning, but "grace" means an affection, a love for what is true.

The Lord had to come. He had to let His humanity flow down into the flesh, into the most external of forms, because that was the only way we were going to see and embrace it.

(References: A Brief Explanation of the Teachings of the New Church 117; The Apocalypse Explained 1069 [3]; The Word 20; True Christian Religion 3, 85)

7850. 'And they shall eat the flesh' means enjoyment of what is good. This is clear from the meaning of 'eating' as enjoyment, dealt with immediately above in 7849; and from the meaning of 'the flesh' as the human proprium made alive by the Lord's Divine Human, thus all the celestial and spiritual good present with a person, dealt with in 3813, 6968. The fact that 'flesh' has this meaning was very well known among the ancients; but at the present day people are so ignorant of it that everyone is amazed when 'flesh' is said to mean such. If one speaks of the proprium as the spiritual entity to which 'flesh' corresponds, people have no understanding of this. If one speaks of it as the symbolic meaning of 'flesh' they do, it is true, understand that, yet their idea is entirely different from that in which the natural object corresponds to the entity it symbolizes; that is to say, they see it as something completely separate. But in actual fact the spiritual or symbolized entity to which it corresponds is linked to it as a person's sight is linked to his eye and his hearing to his ear, and as his thought, which is spiritual, is linked to the form his interiors assume, and through that form to his organs of speech, or as his will, which too is spiritual, is linked to the fibres forming his muscles with which he acts. The same kind of relationship exists with every spiritual entity and its counterpart, that is, with every entity that is symbolized and the natural object that has a correspondence with it.

[2] Who can fail to see that 'flesh' is not used by the Lord to mean flesh or 'blood' to mean blood in John,

Truly, truly, I say to you, Unless you eat the flesh of the Son of Man and drink His blood, you will have no life in you. Whoever eats My flesh and drinks My blood has eternal life, and I will raise him up at the last day. For My flesh is truly food, and My blood is truly drink. John 6:53-56.

Few at the present day know that 'flesh' was used to mean the Divine Good of the Lord's Divine Love, which comes from His Divine Human, and 'blood' to mean the Divine Truth emanating from His Divine Good, and also a person's reciprocation. And those who are capable of knowing this have no wish to know it. They have no wish to know it because they have no affection for truth for its own sake, only for the sake of inducements the world offers, and also because people who think on a natural level wish to understand everything on that level.

[3] These matters have been stated in order that people may know what is meant by 'eating flesh' in the Passover supper, and what is consequently meant by it in the Holy Supper, which was instituted at the Passover supper. Regarding the bread and wine, which have the same meaning as flesh and blood, in the Holy Supper, see 2165, 2177, 2187, 3464, 3478, 3735, 3813, 4211, 4217, 4735, 4976, 5915. The fact that 'flesh' is not flesh in the spiritual sense of the Word is, in addition to other places, plainly evident from the following in John,

Come and gather yourselves to the supper of the great God, so that you may eat [the flesh of kings, and] the flesh of captains, and the flesh of mighty men, and the flesh of horses and those seated on them, and the flesh of all free men and slaves, both small and great. Revelation 19:17-18.

'The flesh', as it is used here, means varying kinds of good.