Matthew Poole and continuators on Daniel 4:19

19 ¶ Then Daniel (whose name was Belteshazzar) was astonied for one hour, and his thoughts troubled him : the king spake and said, Belteshazzar, let not the dream, or the interpretation thereof trouble thee . Belteshazzar answered and said, My lord, the dream be to them that hate thee, and the interpretation thereof to thine enemies .

Because he foresaw such tragical things coming upon the King, for whom he had such reverence for the high favours and honours he had conferred on him, and he was afraid to declare them, these things coming upon him while he was acted by a spirit of Prophesie, doubled his consternation, and troubled his thoughts, Dan. 10.16, 17.

Speak out freely let the event be what it will.

Though this King were a Tyrant, and an Enemy of God, and his People, yet the Prophet is grieved for him and prayed for him that God would avert his judgments from him and lay them rather upon his Enemies, Ieremiah 29.7.