| When Korach brazenly challenged Aaron's appointment to be Kohen Gadol, "Moshe fell down," deeply concerned over the ramifications of this insurgency. It is interesting to note that there is no mention of Aaron's reaction, whatsoever, to Korach's condemnation of him in the entire Parashah. As a result of his humility and holiness, Aaron accepted Korach's criticism. Aaron agreed that he was, in fact, unworthy and that Korach was far more worthy than he to be the Kohen Gadol. In fact, Korach's arrogance in contrast to Aaron's humbleness, was the very reason why HaShem appointed Aaron, and not Korach, to serve as the Kohen Gadol.
Despite Korach's great wisdom and spiritual powers, his yearning for honor disqualified him to serve as Kohen Gadol. Conversely, Aaron's inner purity and humility is the primary reason that HaShem chose Aharon to be the Kohen Gadol.
Envision Aaron HaKohen hearing Korach's assertion that he, and not Aaron was worth of the Kohunah. Sense how Aaron's holiness and humility prompt him to acknowledge that he is inadequate to be the Kohen Gadol. Emulate Aaron's holiness and humility, and receive HaShem's choicest blessings. (Based on the commentary of the Ramban to Parashat Korah) | 
