Volume 3 and 4. The works of Plotinus are presented in chronological order, grouped into four periods; with Biography by Porphyry, Eunapius and Suidas, Commentary by Porphyry, Illustrations by Iamblichus and Ammonius, Studies in sources, development, influence; and an Index of subjects, thoughts and words. By fusing parallel streams of thought, Plotinus became the representative of the post-Platonic age, and translated Greek philosophy into terms later taken up by Christianity. He was the bridge between Plato and Augustine, Thomas Aquinas, Calvin and the Thirty-nine Articles. For his age he did what Plato had done for his, and thereby takes rank beside the latter as one of the peaks in the mountain chains of human thought.