As one of the classic works of contemporary linguistics, this book marks the beginning of the study on cognitive linguistic metaphor systems. The book is both academic and popular. It shows that metaphor is both a vocabulary problem in language and an essential method of human thought processing that participates in not only human cognitive processes but also, more importantly, is the primary method of human living. Metaphor is based on our daily life experience. If we use metaphor effectively, we can, in turn, use metaphors to change our thoughts, thus improving our lives.