Enlightenment (or, more specifically, exactly how one gets enlightened) has become a somewhat taboo subject. For years, American meditation teachers have largely avoided discussing what's known as "the progress of insight" -- the various stages that lead to Nirvana -- with their students. But why? In this episode, Dan gets clear, candid answers from Steve Armstrong, a long-time meditation teacher and the managing editor of the new book "Manual of Insight."