It is common in the Bible for people to "rise up," and it would be easy to pass over the phrase as simply describing a physical action. But in fact it represents an elevation in spiritual state, moving to a more internal frame of mind closer to the Lord. Often it has to do with understanding a new or important idea; we "rise up" to a state of greater perception and enlightenment. Obviously context is crucial to the exact meaning of the phrase in a given passage -- it matters greatly who it is that is rising up, and why.

271. Arrayed in white garments, signifies all truths from good in the lower heavens. This is evident from the signification of "white garments," as being truths that invest, which specifically are true knowledges [scientifica] and cognitions (See above, n. 195, 196, 198); and because the lower heavens are in these truths, they are meant.

That "white garments" signify the lower heavens may seem strange to those who know nothing about appearances and representatives in heaven. All in the heavens are clothed according to truths, and lower truths correspond to garments, and because the lower heavens are in these truths, therefore the garments of the angels in the higher heavens also correspond to these. (But this arcanum may be more clearly understood from what is said and shown respecting the Garments in which the Angels are Clothed, in the work on Heaven and Hell 177-182; likewise from what was represented and signified by the garments of Aaron and his sons, explained in Arcana Coelestia 9814, 10068; as also by the garments of the Lord when He was transfigured, n. 9212, 9216)