Imagination can bring contentment, make happiness possible, and balance reason. It can also tyrannize and dominate our lives, burden our mind and body by leading us to folly in blissful delusion. For some, it exaggerates dangers and prevents action; for others, it spurs on foolish action by promising unrealistic adventure and happiness. For these reasons, understanding and influencing our imaginations with prudent self-control remains essential for a good life. Sometimes we need to hold it in check, other times better to galvanize and encourage.