Boundaries: When to Say Yes, How to Say No To Take Control of Your Life Boundaries by Dr. Henry Cloud and Dr. John Townsend: A life-changing classic with over 4 million copies sold, Boundaries teaches you how to set healthy limits without guilt. Through practical, biblical principles, Drs. Cloud and Townsend show how to stop people-pleasing, take responsibility for your own life, and confidently say “yes” or “no” in relationships with family, friends, coworkers, and even yourself.