He reveals the deep things: This phrase might refer to Zophar’s words that God’s knowledge is "deeper than Sheol" (11:8).
darkness … deep shadows: The Old Testament often describes God as living in darkness and showing himself through darkness (1 Kings 8:12; 2 Chronicles 6:1; 2 Samuel 22:10, 12; Psalm 18:9, 11). Examples are when he gave the law at Sinai or when he comes in judgment (Deuteronomy 4:11; 5:22–23; Zephaniah 1:15).