Poetry doesn't matter to most people, observes Jay Parini at the opening of this book. But, undeterred, he commences a deeply felt meditation on poetry, its language and meaning, and its power to open minds and transform lives. By the end of the book, Parini has recovered a truth often obscured by our clamorous culture: without poetry, we live only partially, not fully conscious of the possibilities that life affords. Poetry indeed matters.

A gifted poet and acclaimed teacher, Parini begins by looking at defenses of poetry written over the centuries. He ponders Aristotle, Horace, and...