Albert Barnes Commentary Daniel 2:47

"The king answered unto Daniel, and said, Of a truth your God is the God of gods, and the Lord of kings, and a revealer of secrets, seeing thou hast been able to reveal this secret." — Daniel 2:47 (ASV)

The king answered unto Daniel – He answered either what Daniel had said in the interpretation of the dream, or "possibly" something Daniel had said regarding the impropriety of offering this homage to him (Compare to the notes at Daniel 2:46).

It is certain that, for some cause, whatever might have been the homage he was disposed to offer Daniel, his thoughts were soon turned from him to the true God, and to an acknowledgment of Him as superior to all other beings. He seems, at least, instantly to have reflected on what Daniel himself had said (Daniel 2:30), and to have remembered that religious homage was due, not to Daniel, but to the God who had communicated the secret to him.

Of a truth it is – It is truly so. This had been shown by the manner in which this secret was disclosed.

That your God is a God of gods – He is superior to all other gods; He is supreme over all (1 Timothy 6:15). The idea is that whatever subordinate beings there may be, He is supreme.

And a Lord of kings – He is supreme over kings. They are all inferior to Him and subject to His control.

And a revealer of secrets – This is one of the attributes of divinity (See the notes at Daniel 2:28).

Seeing thou couldest reveal this secret – This was a secret which the wisest men of the realm had sought in vain to disclose. The fact that a professed servant of God had been able to do this showed that God Himself was supreme and worthy of adoration.

We have here, then, an instance in which a proud and haughty pagan monarch was brought to an acknowledgment of the true God and was constrained to offer Him homage. This was a result which it was evidently intended to reach in the whole transaction: in the dream itself; in the fact that the wise men of Babylon could not interpret it; and in the fact that an acknowledged servant of the Most High had been enabled to make the disclosure.

The instance is instructive, as showing to what extent a mind clearly not under the influence of any genuine piety—for subsequent events showed that no "permanent" effects were produced on him, and that he was still an idolater (Daniel 3) and a most proud and haughty man (Daniel 4)—may be brought to acknowledge God.

(See the remarks at the end of Daniel 7).