"Life has to have the plenitude of art," Edward Hirsch affirms in his fifth volume of poems, On Love, which further establishes him as a major artist. From its opening epigraph by Thomas Hardy and an initiating prayer for transformation, On Love takes up the subjects of separateness and fusion, autonomy and blur. The initial progression of fifteen shapely and passionate lyrics (including a sonnet about the poet at seven, a villanelle about the loneliness of a pioneer woman on the prairie, and an elegy for Amy Clampitt) opens out into a sequence of meditations about love. These arresting love poems are spoken by a gallery of historical figures from Denis Diderot, Heinrich