Daniel 6:25 - Albert Barnes' Notes on the Bible

Then king Darius wrote unto all people ... - Compare the note at Daniel 2:47; Daniel 3:29; Daniel 4:1. If there is a probability that Nebuchadnezzar would make such a proclamation as he did, there is no less probability that the same thing would be done by Darius. Indeed, it is manifest on the face of the whole narrative that one great design of all that occurred was to proclaim the knowledge of the true God, and to secure his recognition. That object was worthy of the Divine interposition, and the facts in the case show that God has power to induce princes and rulers to recognize his existence and perfections, and his government over the earth.