What does Daniel 2:7 mean?

When king Nebuchadnezzar was deeply troubled by a dream, he brought a test to his royal magicians. Rather than telling them the dream and asking for interpretation, he insisted the spiritualists tell him what the dream was about. In this way, he puts their claims to a harsh test. If they claim supernatural power to discover the meaning of a dream, shouldn't they also have the power to know what someone had dreamed in the first place (Daniel 2:1–4)? Nebuchadnezzar is serious about this issue, promising either torture and death or great reward depending on how he is answered (Daniel 2:5–6). It's no surprise they are stalling for time (Daniel 2:8).

Had Nebuchadnezzar forgotten his dream, the sorcerers and mediums could have invented one. Had he told them the dream, they could have claimed almost any meaning (Daniel 2:9). Because he knows the dream, and they don't, Nebuchadnezzar can directly test the knowledge of his conjurers. Eventually, they will admit his challenge is beyond any mortal person: only a real god could know such things (Daniel 2:10–11). The wisdom of the wise always falls short of divine wisdom. Even the world's wisest men are incapable of understanding and accepting spiritual truth unless God opens their minds and hearts to receive it (1 Corinthians 1:20–21). Only through God's power will the king's request be granted (Daniel 2:27–35).