John Calvin Commentary Daniel 2:10

"The Chaldeans answered before the king, and said, There is not a man upon the earth that can show the king`s matter, forasmuch as no king, lord, or ruler, hath asked such a thing of any magician, or enchanter, or Chaldean." — Daniel 2:10 (ASV)

The Chaldeans again excuse themselves for not relating the king’s dream. They say that, in reality, this is not their specific art or science; and they know of no example handed down of wise men being asked in this way, and required to answer both de facto and de jure, so to speak. They boasted that they were interpreters of dreams, but their conjectures could not extend to discovering the dreams themselves, only their interpretation.

This was a just excuse, yet the king does not admit it, but is impelled by his own wrath and by the divine instinct to show the Magi, and sorcerers, and astrologers, to be mere impostors and deceivers of the people. And we must observe the end in view, because God wished to extol his servant Daniel, and to separate him from the common herd.

They add that no kings had ever dealt with Magi and wise men in this way.