In Ennead I.5 Plotinus attempts to navigate a well-trodden path of inquiry by directly responding to a wide spectrum of popular theories on human flourishing, and insisting emphatically that well-being belongs to the present moment. Indeed, Aristotle—with his insistence that well-being be measured by “a complete life” (Nicomachean Ethics 1098a16–20) or a life measured by virtue, a modus vivendi sustained via the development of appropriate habits (hexis) and the avoidance of misfortunes—is one of Plotinus’ central targets.

Nevertheless, it is also obvious that the Hellenistic schools, with their almost evangelical insistence that happiness is available to practitioners in the immediacy of the “now,” take pride of place in Plotinus’ short treatise on the subject. Layne analyzes in depth Plotinus’ unique conception of the value of the present moment by highlighting his dialogue with Aristotle and Hellenistic conceptions of the soul, pleasure and pain, time and eternity, and so forth.

Plotinus was a Platonist, committed to expounding the doctrines put forward by Plato some seven centuries earlier. He was born and educated in Egypt, where he studied the teachings of Plato under the guidance of Ammonius Saccas. He came to Rome in 244 CE and built up a circle of followers devoted to studying Plato through Plato's own works and those of philosophers, both Platonist and non-Platonist, of the intervening centuries. From his fiftieth year Plotinus himself wrote down, in Greek, the findings of the seminars, and these writings were later edited by one of his pupils, Porphyry, and published in six groups of nine treatises entitled the Enneads (from the Greek word for nine – ennea).