Selection from Apocalypse Explained ~ Emanuel Swedenborg
The Lord in respect to His Divine Human is the Word, that is, the Divine truth
In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made. In him was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not.
There was a man sent from God, whose name was John. The same came for a witness, to bear witness of the Light, that all men through him might believe. He was not that Light, but was sent to bear witness of that Light. That was the true Light, which lighteth every man that cometh into the world.
He was in the world, and the world was made by him, and the world knew him not. He came unto his own, and his own received him not. But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth. (John 1:1-14)
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Such a power of persuading and confirming any heresy whatever from the Word is well known in the Christian world from the many heresies there, everyone of which is confirmed from the sense of the letter of the Word and thus they are persuaded. The reason is that the sense of the letter of the Word is accommodated to the apprehension of the simple, and therefore consists in large part of appearances of truth; and it is the nature of appearances of truth to be capable of being adapted to confirm anything that anyone may adopt as a principle of religion and thence of doctrine, thus even when it is false.Consequently those who place genuine truth itself in the sense of the letter of the Word only, are open to many errors unless they are in enlightenment from the Lord, and in that enlightenment form doctrine for themselves that will serve them as a lamp.
In the sense of the letter of the Word there are naked truths as well as truths clothed, and these latter are appearances of truth, and appearances of truth can be understood only from passages where naked truths stand out — out of these, doctrine can be formed by one who is enlightened by the Lord, and according to that doctrine all other things can be explained. This is why those who read the Word without doctrine are led into manifold errors.
The Word was so written in order that there might be a conjunction of heaven with man; and there is a conjunction because every expression in the Word, and in some passages every letter, contains a spiritual sense, in which the angels are; consequently when man perceives the Word according to its appearances of truth the angels that are about man understand it spiritually. Thus the spiritual of heaven is conjoined with the natural of the world in respect to such things as contribute to man's life after death. If the Word had been written otherwise no conjunction of heaven with man would have been possible.
And because the Word in the letter is such it serves as it were as a support for heaven — for all the wisdom of the angels of heaven in respect to things pertaining to the church terminates in the sense of the letter of the Word as in its basis; consequently the Word in the letter may be called the support of heaven. For this reason the sense of the letter of the Word is most holy, and is even more powerful than its spiritual sense, as has been made known to me by much experience in the spiritual world, for when spirits bring forward any passage according to the sense of the letter they immediately excite some heavenly society to conjunction with them.
From this it can be seen that all things of the doctrine of the church are to be confirmed from the sense of the letter of the Word that there may be in them any sanctity and power, and moreover from those books of the Word in which there is a spiritual sense. Thence it is also evident how dangerous it is to falsify the Word even to the destruction of the Divine truth that is in its spiritual sense; for by so doing heaven is closed to man. That this is done by those who confirm by the Word the separation of faith from its life, which is good works.
(from Apocalypse Explained 816)