Philosophical poetry is seldom original; and ever since the assertion by Alexander Dalrymple, in the eighteenth century, that “Sir John Davies' poem on the Immortality of the Soul is chiefly taken from Nemesius,” there has been speculation as to the source of that once popular work. Grosart, in editing Davies' poems, rejected Dalrymple's statement as “absolutely untrue, an utter delusion,” and claimed for his author the merit of “deep and original thought.” But other critics have generally ignored this claim and suggested various sources for the poet's inspiration. Courthope again named Nemesius as the most probable. In a volume devoted exclusively to the study of this poem, Professor E. H. Sneath maintained that Davies was influenced by four thinkers: Aristotle, Cicero, Nemesius and Calvin. A German scholar more recently denies any influence of Nemesius, but thinks Davies derived his ideas from a study of Aristotle's De Anima modified by a reading of religious commentators, notably Thomas Aquinas. The latest and best suggestion, although it has been presented only in a brief and casual manner, is, that Nosce Teipsum is a re-statement of the Neo-Platonic tradition which permeated Christian thought in the Middle Ages and Renaissance.