This is the first complete modern edition of Henry More's long philosophical poem, A Platonick Song of the Soul (1647). This early work, written in Spenserian stanzas, is a sustained literary presentation of the Neoplatonic doctrine of the immateriality and immortality of the soul. The Introduction to this book discusses both the literary background of the work and its varied philosophical and scientific sources, from Plotinus to Ficino and Galileo.