What does Daniel 2:22 mean?

King Nebuchadnezzar devised a test for his royal magicians: to tell him what he had dreamed, rather than simply telling him what a dream meant (Daniel 2:1–6). He suspected they had been lying to him, and their inability to discern his mystery proved they had no spiritual insight (Daniel 2:8–11). Daniel, however, relied on the power of God and was given a vision explaining what he needed to know (Daniel 2:17–19). Later, Daniel will make it clear that he, himself, was not the source of this information, but that the Lord was the One who provided it (Daniel 2:27–28).

Nothing is hidden from God, not even things covered up or hidden by or to humans (Psalm 44:21; Ecclesiastes 12:14; Mark 4:22; Hebrews 4:13). God knows what is in darkness even though He dwells in the light. Extolling God's omniscience in Psalm 139:11–12, David writes: "If I say, 'Surely the darkness shall cover me, and the light about me be night,' even the darkness is not dark to you; the night is bright as the day, for darkness is as light with you." When God saves a sinner, He shines in his heart "to give the light of the knowledge of the glory of God in the face of Jesus Christ" (2 Corinthians 4:6).