'The former heavens, which passed away,' as mentioned in Revelation 21:1, signify the societies of people in the spiritual world who were only in external or apparent good. (Apocalypse Explained 675) Heavens are celestial and spiritual things. Consequently, they are inmost things, both of the Lord's kingdom in heaven and in the earth. This also refers to the church, and every individual, who is a kingdom of the Lord, or a 'church.' Consequently, heavens denote all things pertaining to love and charity, and faith grounded in them, as well as all things pertaining to internal worship. In like manner they denote all things pertaining to the internal sense of the Word. All these things are heavens, and are called, 'the throne of the Lord.' (Arcana Coelestia 2162)

(References: Apocalypse Explained 21)

22. Grace to you and peace, signifies the delight of truth and good. This is evident from the signification of "grace" as being the delight of truth (about which more presently); and from the signification of "peace," as being the delight of the good of innocence and love (on which see in the work on Heaven and Hell, where the State of Peace in Heaven is treated of, n. 284-290). "Grace" means the delight of truth, because there are two things that proceed from the Lord, united in their origin, but separated with those that receive them. For there are those that receive more the Divine truth than the Divine good, and those that receive more the Divine good than the Divine truth. Those that receive more the Divine truth than the Divine good are in the Lord's spiritual kingdom, and are therefore called spiritual; but those that receive more the Divine good than the Divine truth are in the Lord's celestial kingdom, and are therefore called celestial (On these two kingdoms in heaven and in the church, see in the work on Heaven and Hell 20-28.) To those in the spiritual kingdom it is granted by the Lord to be in the affection of truth for the sake of truth; and this Divine is what is called grace; so far, therefore, as anyone is in that affection is he in the Lord's Divine grace; nor is there any other Divine grace with man, spirit, or angel, than to be affected by truth, because it is truth, since in that affection there is heaven and blessedness for them (See in The New Jerusalem and its Heavenly Doctrine, n.232, 236, 238; and Heaven and Hell 395-414). Whether we say the affection of truth or the delight of truth it is the same; for there is no affection without delight.

[2] This in particular is what is meant by "grace" in the Word; as in John:

And the Word became flesh, and dwelt in us, and we beheld His glory, a glory as of the only-begotten from the Father, full of grace and truth, of His fullness we all received, and grace for grace. For the law was given through Moses; grace and truth came through Jesus Christ (John 1:14, 16-17).

It is said "grace and truth," because grace is the affection and the delight of truth. And in Luke, after the Lord had explained in the synagogue the prophesy of Isaiah respecting Himself, that is, the Divine truth, it is said:

All wondered at the words of grace proceeding out of His mouth (Luke 4:22).

the Divine truths that the Lord spoke are called "words of grace proceeding out of His mouth," because they are acceptable, grateful, and delightful. In general, Divine grace is all that is given from the Lord; and as all that is so given has relation to faith and love, and faith is the affection of truth from good, this is meant in particular by Divine grace: for to be gifted with faith and love, or with the affection of truth from good, is to be gifted with heaven, thus with eternal blessedness.