One troubling aspect of Parshat Korah is that the rebellion never dies down. That seems to be because there are real issues here - Moshe and Aharon seem to have all the closeness to God, and the people do not share in the leadership or decision-making. So what was the problem with Korach? Is it possible for non-Leviim to attain holiness? The example of Shmuel ha-Navi provides a key.