This the prophet repeats, to put Belshazzar in mind how God dealt with his father; for it is good for kings to read over the story of their ancestors, and take warning, and take example. In the first they are seamarks, in the second landmarks.
Related Commentaries of Daniel 5:18
Daniel 5:18
18 O thou king, the most high God gave Nebuchadnezzar thy father a kingdom, and majesty, and glory, and honour: