Why will preachers and theologians who mislead people receive the worst judgment?
They will receive the severest judgment because they mislead multitudes away from the Gospel of grace. Such a person is doomed to stand before the great white throne as a lost person and be judged there, bearing sure judgment for turning people from God's grace.
Les explains that Paul warns the one troubling them will bear his judgment, whoever he is, because he is bringing in false teaching and leading people away from the Gospel of grace. That judgment is sure: he will stand before the great white throne as a lost person and be judged absolutely. Les says that preachers and theologians who mislead people will have the hottest corner in the lake of fire, because they mislead multitudes. He also stresses that anyone who picks up this book—whether a Sunday school teacher or someone leading a small devotional—accepts a tremendous responsibility.