'The first resurrection,' mentioned in Revelation 20:5, 6, does not mean a first resurrection, but the essence and primary part of resurrection, which is salvation and eternal life. There is only one resurrection to life. A second does not happen, and is not mentioned anywhere in the Bible.

(References: Apocalypse Explained 6; Apocalypse Revealed 851; Revelation 20:5-6)

288. Since God is a person, the whole angelic heaven, taken as a single unit, presents itself as a single person. It is divided into regions and districts according to our human members, organs, and viscera. There are heavenly communities that make up the district of the brain and all its components, of all the facial parts, and of all our physical internal organs; and these districts are distinguished from each other exactly the way they are in us. In fact, angels know what district of the [heavenly] person they live in.

Heaven as a whole has this appearance because God is a person; and God is heaven because the angels who constitute heaven are recipients of love and wisdom from the Lord, and recipients are images.

I have explained at the close of a series of chapters in Secrets of Heaven that heaven is in the human form in all respects.