Often people think: "If I were running things I would do a much better job". They do not realize that the One who is running the show is the One who created all solutions, yet decided to let events run a different course than they would have predicted.
Korach watched his cousins Moshe Rabbeinu, Aharon Hakohen, and finally Elizafan ben Uziel take the reins of leadership. He was not used to playing second fiddle, particularly not to a younger cousin like Elizafan. Instinctively, he felt that a serious injustice was being done to him and he decided to rectify it. In the passion of his jealousy, however, he forgot that our understanding of the things can be very limited. Even people as great as he, who saw prophetically that his descendants would be leaders, must remember that without knowing Everything, nothing can really be known absolutely. Only that which is divinely proclaimed is bound to happen; any additions and assumptions we add on are as frail as any human invention.
Like all holiness, the Jewish People are patterned in the likeness of the human body. Just as the body has flesh covering its bones and skin covering the flesh, so does the Jewish People have Kohanim serving in the sanctuary and Leviim surrounding them. A person with flesh on the outside and skin on the inside cannot live.
Throughout the Parsha we find Moshe Rabbeinu humbling himself further and further, prostating to the ground before the Creator of the Universe, accepting His Will completely, and trying to placate his opponents. Finally, when he saw that this hideous skinless creature was determined to be born, he asked Hashem that Korach the inventor of this G-d forsaken non-entity, should cease to exist.
We can not invent new types of holiness. We can emulate the Creator's holiness and become G-dly, or we can separate ourselves and become nothing.
Based on Rabbi Vali's book on Bamidbar. Questions and subscriptions can be mailed to: the Yeshiva