Authentic Happiness
Martin Seligman is the guy who began the Positive Psychology movement, which has provided some of the most useful insights into how to improve our mental wellbeing. Authentic Happiness is packed with the results of studying how happy people create their happiness - and how unhappy people can change. Optimism is a state of mind that can be created. As therapists it's really worthwhile knowing how.
Word Weaving: The science of Suggestion
Word Weaving II: The question is the answer