"The Emotions of Normal People" is a book written by William Moulton Marston, a psychologist and polymath who was active in the early 20th century. The book is a pioneering work on the subject of emotions and their role in human behavior. It provides an in-depth examination of the nature of emotions and their impact on human thought and behavior.

The main lessons of the book include:

1. The Definition of Emotion: Marston defines emotion as a complex experience that involves physiological arousal, cognitive appraisal, and behavioral expression. He argues that emotions are not just a product of physiological arousal but also involve cognitive and behavioral components.

2. The Role of Cognition in Emotion: Marston argues that emotions are not just a product of physiological arousal but also involve cognitive processes such as interpretation, appraisal, and attention. He explains that emotions are shaped by the way we perceive and interpret the world around us.

3. The Importance of Bodily Feedback in Emotion: Marston emphasizes the importance of bodily feedback in the experience of emotions. He explains that emotions are not just psychological phenomena but also involve physiological arousal and that the body plays a crucial role in the experience of emotions.

4. The Impact of Emotions on Thought and Behavior: Marston argues that emotions play a crucial role in shaping our thoughts and behavior. He explains that emotions influence the way we perceive and interpret the world around us, and that they can also influence our behavior.

5. The Differentiation between Emotion and Feeling: Marston differentiates between emotion and feeling, arguing that emotions are physiological and behavioral reactions while feelings are the conscious experiences of these reactions.

6. The Influence of Emotions on Decision Making: Marston illustrates how emotions can influence decision-making, by highlighting how emotions can bias judgments and influence choices.

7. The Importance of Emotional Intelligence: Marston emphasizes the importance of emotional intelligence and the ability to understand and manage one's own emotions and the emotions of others in order to be successful in life.

8. The Interconnectedness of Emotions: Marston explains that emotions are interconnected and that different emotions can influence each other. He also highlights the importance of understanding and managing emotions in order to lead a balanced and fulfilling life.

Overall, "The Emotions of Normal People" is a valuable and pioneering work that provides insight into the nature of emotions and their role in human behavior. It is an important read for anyone interested in the field of psychology and the study of emotions.