Revealing things represents making them known. "Deep things from darkness" represent secrets that people do not know. AT: "He makes known secrets that people do not know" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Bringing things out into the light represents making them known, and here "shadows" is a metonym for the things that are hidden in the shadows, which in turn are a metaphor for truths that God has hidden from people. AT: "makes known things that no one can see" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-metonymy]])