Shared ground
The passage presents a clear chain of cause and effect: Uzziah becomes strong, his “heart is lifted up,” and that inner change leads to an act the narrator calls corrupt and a trespass against Yahweh. The concrete trespass is not vague: he enters Yahweh’s temple intending to burn incense on the incense altar.
It also presents a clear boundary inside temple worship. Azariah and eighty priests oppose the king and state that incense-burning “pertains” to the consecrated sons of Aaron, not to the king. The story assumes that royal authority does not automatically include priestly duties.
Where interpretation differs
Some readers take “his heart was lifted up” as straightforward arrogance that produced a specific sinful act. Others allow that the phrase can describe a rise in self-confidence or status that becomes arrogance when it crosses a boundary—so the problem is less “feeling strong” and more overreaching in a sacred role.
Some also read “he did corruptly” as describing this one temple intrusion in summary form. Others think it hints at broader deterioration in Uzziah’s conduct, with the temple act serving as the climax that reveals it.
Why the disagreement exists
The wording links inner attitude (“heart lifted up”) to outward action but does not spell out every step. Likewise, “did corruptly” can function either as a label for the single act that follows or as a broader assessment. The passage gives a specific example (incense) but leaves room about how long the pattern had been forming.
What this passage clearly contributes
Explicitly, it portrays pride (or elevated self-regard) as a spiritual danger precisely at the point of strength and success. It also presents the temple as ordered space with assigned responsibilities: incense at the altar is reserved for Aaron’s consecrated priestly line, and priests can “withstand” a king when he violates that boundary. The priests’ warning frames the issue as honor before Yahweh—public standing granted by God—rather than merely personal preference or palace politics. See also 2 Chronicles 26:18.