The essence of Plotinus : extracts from the six Enneads and Porphyry's life of Plotinus / based on the translation by Stephen Mackenna; with an appendix giving some of the most important Platonic and Aristotelian sources on which Plotinus drew, and an annotated bibliography, compiled by Grace H. Turnbull; foreword by the Very Reverend W. R. Inge, D. D.