In the parallel account at 2 Chronicles 26: 3 - 5, 16 - 21, we learn that although Uzziah did what was right in Jehovah’s eyes for a time, later in life “his heart became haughty to his own ruin. ”
فَقَدْ أَرَادَ بِكُلِّ وَقَاحَةٍ أَنْ يُؤَدِّيَ مَهَامَّ كَهَنُوتِيَّةً لَمْ تَكُنْ جُزْءًا مِنْ مَسْؤُولِيَّتِهِ .‏