Arcana Coelestia # 6346
6346. 'Light as water' means that faith alone does not possess such qualities, neither glory nor powerfulness. This is clear from the meaning of 'being light as water' as having no weight or worth. The fact that faith alone is meant, that is, faith separated from charity, is evident from the things mentioned in what follows that involve Reuben, and that involve Simeon and Levi. Those men - Reuben, Simeon, and Levi - are used here also to refer to faith alone or faith separated from charity.
Smyrna
In Revelation 1:11, 2:8, this signifies the church of people who led good lives from good, but hold false doctrines. (Apocalypse Revealed 91)
Smyrna signifies people in the church who wish to understand the Word but currently do not, and so have little knowledge of truth and good but wish to learn. (Apocalypse Explained 112)
(Referências: Revelation 2)