Shared ground
Daniel’s speech treats kingship as something granted, not self-made. Nebuchadnezzar’s “greatness” is explicitly said to be given by “the Most High God” (vv. 18–19). The fear he inspired and the life-and-death control he exercised are described as real and wide-reaching.
The passage also treats pride as morally significant and accountable. When Nebuchadnezzar’s inner posture turned proud and stubborn, he was removed from power and publicly reduced (vv. 20–21). That reversal had a stated endpoint: it lasted “until” he recognized that God rules human kingdoms and appoints rulers as he chooses (v. 21; cf. whomever).
Belshazzar is then judged with special weight because he “knew all this” and still refused to humble himself (v. 22). Daniel ties this refusal to specific acts: exalting himself against the “Lord of heaven,” profaning the temple vessels, praising material gods that lack perception, and failing to honor the God who holds his breath and governs his ways (v. 23). The writing on the wall is presented as a direct response (v. 24).
Where interpretation differs (only where needed)
One question is what “father” and “son” mean here (vv. 18, 22). Some read it as biological (Nebuchadnezzar as Belshazzar’s literal father). Others read it as royal predecessor/ancestor language used at court, meaning Belshazzar stands in Nebuchadnezzar’s dynastic legacy without being his direct son.
Another question is how to take the animal-like description (v. 21). Some read it as a literal period of insanity with animal-like behavior. Others understand it as stylized royal humiliation language that communicates extreme degradation without requiring every detail to be pressed as clinical description.
A third question is what “knew all this” means for responsibility (v. 22). Some take it as strong enough to make Belshazzar fully culpable for repeating a well-known lesson. Others allow that “knowing” might include partial awareness yet still sees Daniel’s point: he had sufficient knowledge to be accountable.
Why the disagreement exists
The story uses courtly titles (“father/son”), vivid narrative description (animal imagery), and a moral indictment built on shared historical memory (“you knew”). Those features can be read either more literally or more as conventional ways of speaking in royal and prophetic speech.
What this passage clearly contributes
Explicitly, it presents God as the one who gives and removes royal power and expects rulers to recognize that higher authority (vv. 18, 20–21). It also links pride to downfall, and knowledge to heightened accountability (vv. 20–22). The passage frames idolatry not only as worshiping objects, but as failing to honor the living God who sustains life (“your breath”) and oversees a person’s course (“all your ways”) (v. 23). Finally, it explains the writing as a purposeful divine act, not a random omen (v. 24).