Many consider envy a negative quality, one of Seven Deadly Sins, while others regard it as a spur to personal accomplishment, useful despite the turmoil it may bring. Dr. Geenleaf addresses both its negative, painful aspects, and its positive, constructive uses. This comprehensive study examines the contexts of envy s usages and raises a broad range of questions. By exploring our shifting interpretations of this shadowy universal phenomenon, Dr. Greenleaf challenges us to get serious about coming to terms with it, providing us a starting point and an opportunity to learn more about how we think and behave.