King Uzziah went into the Temple of the Lord to burn incense to the Lord. Burning incense by someone—even a king—who was not of the descendants of Aaron was a grievous breach of Levitical law punishable by death. King Uzziah represents self-exaltation and self-will in the Christian.
It is impossible to behold the Lord’s glory when we are filled with self-love and are pursuing our own will and way. When self-exaltation and self-will die, then we shall see the Lord sitting on His throne—high and lifted up.