Book excerpt: Research has indicated that spiritual and religious factors are strongly tied to a host of mental health variables, both positive and negative. That body of research has significantly grown since publication of the first edition 20 years ago. The second edition of the Handbook of Spirituality and Religion and Mental Health identifies not only whether religion and spirituality influence mental health and vice versa, but also how and for whom. The contents have been re-organized to speak specifically to categories of disorders in the first part of the book and then more broadly to life satisfaction issues in the latter part of the book. Hence 100% of the book is now revised with new chapters and new contributors.