Only in recent years has the full importance of Plotinus been widely recognized. Previously, Neoplatonism, of which Plotinus is the greatest representative, and Platonism had not been clearly distinguished. Lacking the original writings to compare, scholars in the Middle Ages blended the two forms of thought together without a clear notion of their distinctive qualities. Historical research and the availability of the sources themselves have produced a growing awareness of the distinctiveness of Plotinus’s thought and of his unique contributions in The Enneads. Its intimate connection with the Platonic tradition is readily admitted by Plotinus himself, but such closeness in origin need not mean similarity, as Plato’s famous student Aristotle made clear.
In a strict sense, The Enneads are unsystematic. Neither Porphyry’s ordering of the scattered writings nor scholarly reconstruction of possible temporal sequence can make the writings form any strictly logical order. Plotinus discussed with his students a few very central philosophical problems, each of which he returned to many times, and The Enneads represent in content but not in form the consistency of this continual development of certain central themes.