Apocalypse Explained # 416
416. Verse 1. And after these things I saw, signifies a new perception as to the state of heaven before the Last Judgment. This is evident from what follows in this chapter, which treats of the separation of the good from the evil; for before the Last Judgment occurs the good are separated from the evil by the Lord, and are led away; and because this is involved in the things that were seen, so all this is here signified by "after these things I saw."
Arcana Coelestia # 5887
5887. 'And now, do not be grieved' means anxiety in the heart or will. This is clear from the meaning of 'grief' as anxiety, existing indeed in the heart or will. For the words that immediately follow 'do not have any anger in your eyes' mean sadness in the spirit or understanding. The expressions 'in the heart or will' and 'in the spirit or understanding' are used because 'the heart' has reference through correspondence to desires in the will, for it has reference to what is celestial, which is the good of love. But 'the spirit', which is associated with the lungs, has reference to ideas in the understanding, for it has reference to what is spiritual, which is the truth of faith, see 3635, 3883-3896.