The basic principle in life that we learn from Rebbe Nachman is that anyone who fails to spend a daily hour in serious self assessment most surely makes mistakes and leads others astray, even if he is a Torah scholar or a rabbinical lecturer. What's more, without daily self-assessment, he won't identify his own shortcomings and therefore might look at himself as if he's the Moses of this generation. With such fantasies, he's liable to fall to the lowest depths. And, the more he has a position of leadership, the more danger he's in. Rebbe Nachman teaches (Likutei Moharan I:18) that oftentimes a person considers himself to be a worthy leader, considering himself to be concerned with the welfare of others. Really though, he's only concerned with his own self-aggrandizement.
Reb S. Arush