The reason why the Lord says, "To him that overcometh will I give to sit with Me in my throne, as I overcame and sit with the Father in His throne," is because the union of the Lord with the Father, that is, with His Divine within Himself, took place, to the end that it might be possible for man to be conjoined to the Divine which is called the Father in the Lord; because it is impossible for man to be conjoined with the Divine of the Father immediately, but mediately through His Divine Human, which is the Divine natural; therefore the Lord says:
No one hath seen God at any time; the Only-begotten Son, who is in the bosom of the Father, He hath manifested Him (John 1:18).
I am the way, the truth, and the life, no one cometh to the Father, but by Me (John 14:6).
The Lord's conjunction with man is by His Divine truth, and this in man is of the Lord, thus the Lord, and by no means man's, consequently is not man. Man, indeed, feels it as his own, but still it is not his, for it is not united to him, but adjoined; not so the Divine of the Father, this is not adjoined but united to the Lord's Human, as the soul to its body. He who understands these things may understand the following words of the Lord:
He that abideth in Me and I in him, the same bringeth forth much fruit, for without Me ye can do nothing (John 15:5).
In that day ye shall know that I am in My Father, and you in Me, and I in you (John 14:20).
Sanctify them in Thy truth; Thy Word is truth; for their sakes I sanctify Myself, that they also might be sanctified in the truth: that they all may be one, as Thou, Father, art in Me, and I in Thee, that they also may be one in Us; I in them and Thou in Me (John 17:17, 19, 21, 23).
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Conjunction is of the Lord with the angel and of the angel with the Lord; conjunction, therefore, is reciprocal. On the part of the angel it is as follows: The angel, in like manner as man, has no other perception than that he is in love and wisdom from himself, consequently that love and wisdom are, as it were, his or his own. Unless he so perceived there would be no conjunction, thus the Lord would not be in him, nor he in the Lord. Nor can it be possible for the Lord to be in any angel or man, unless the one in whom the Lord is, with love and wisdom, has a perception and sense as if they were his. By this means the Lord is not only received, but also, when received, is retained, and likewise loved in return. And by this, also, the angel is made wise and continues wise. Who can wish to love the Lord and his neighbor, and who can wish to be wise, without a sense and perception that what he loves, learns, and imbibes is, as it were, his own? Who otherwise can retain it in himself? If this were not so, the inflowing love and wisdom would have no abiding-place, for it would flow through and not affect; thus an angel would not be an angel, nor would man be a man; he would be merely like something inanimate. From all this it can be seen that there must be an ability to reciprocate that there may be conjunction.
... Every angel has freedom and rationality; these two he has to the end that he may be capable of receiving love and wisdom from the Lord. Yet neither of these, freedom nor rationality, is his, they are the Lord's in him. But since the two are intimately conjoined to his life, so intimately that they may be said to be joined into it, they appear to be his own. It is from them that he is able to think and will, and to speak and act; and what he thinks, wills, speaks, and does from them, appears as if it were from himself. This gives him the ability to reciprocate, and by means of this conjunction is possible.
Yet so far as an angel believes that love and wisdom are really in him, and thus lays claim to them for himself as if they were his, so far the angelic is not in him, and therefore he has no conjunction with the Lord; for he is not in truth, and as truth makes one with the light of heaven, so far he cannot be in heaven; for he thereby denies that he lives from the Lord, and believes that he lives from himself, and that he therefore possesses Divine essence.
In these two, freedom and rationality, the life which is called angelic and human consists. From all this it can be seen that for the sake of conjunction with the Lord, - the angel has the ability to reciprocate, but that this ability, in itself considered, is not his but the Lord's. From this it is, that if he abuses his ability to reciprocate, by which he perceives and feels as his what is the Lord's, which is done by appropriating it to himself he falls from the angelic state. That conjunction is reciprocal, the Lord Himself teaches (John 14:20-24; 15:4-6); also that the conjunction of the Lord with man and of man with the Lord, is in those things of the Lord that are called His words (John 15:7).
(Apocalypse Revealed 222; Divine Love and Wisdom 115,116)