Apocalypse Explained #230
230. (Verse 15) I know thy works. That this signifies the life of faith alone is evident from the signification of works as being those things that belong to the interior life of man, because works proceed from those things, and are their effects (concerning which see above, n. 157, 185). Here therefore they signify the life of faith alone, because this is treated of in what is written to the angel of this church. To each of the churches it is premised, "I know thy works," and in every case it signifies the things belonging to the church there treated of (see above, n. 98); therefore the quality of the life of faith alone, or of faith separated from charity, is described in what now follows.
John 1:4-5
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In him was life; and the life was the light of men.
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And the light shineth in darkness; and the darkness comprehended it not.