Tusculan Disputations is a philosophical work by Roman orator and statesman Cicero. The book is divided into five parts, each of which deals with a different topic related to human happiness. In the first book, Cicero discusses the nature of death and argues that it is not something to be feared. In the second book, he discusses the nature of pain and argues that it is not the worst thing that can happen to a person. In the third book, he discusses the nature of grief and argues that it is a natural human emotion that should not be suppressed. In the fourth book, he discusses the nature of virtue and argues that it is the only true source of happiness. In the fifth book, he discusses the nature of wisdom and argues that it is the key to a happy and fulfilling life.