Plutarch was born in Chaeronea, a small city in Boeotia, Greece, where he would spend most of his life and which he served as a local magistrate and civic leader. He received his philosophical education in Athens under Ammonius, a Platonist who instilled in him the commitment to ethical philosophy and the examined life that would animate his entire literary career. He visited Rome, lectured there, and formed enduring friendships with men of consular rank, earning the respect of the emperors Trajan and Hadrian; late in life he held the honorary position of imperial procurator for Greece. He was also a priest at the sanctuary of Apollo at Delphi for the last thirty years of his life, a role that drew him toward the questions of religious tradition, divine providence, and the moral significance of the cosmos that pervade his essays. Plutarch was a man of the middle ground in several senses: philosophically he was a Middle Platonist, convinced that Plato's thought could be harmonised with Aristotelian ethics and that philosophical inquiry was inseparable from civic virtue; culturally he was a Greek who moved comfortably in the Latin world of the Roman Empire while remaining deeply committed to the preservation and transmission of Greek civilisation. His Parallel Lives and Moralia together constitute one of the richest survivals of ancient prose literature, and his influence on subsequent thinking about biography, moral education, character formation, and the relationship between personal virtue and political life has been continuous from the Renaissance to the present day.

Plutarch invented, or at least perfected, the use of biography as a form of moral instruction. His Parallel Lives — forty-six surviving biographies of Greek and Roman statesmen arranged in pairs, each Greek hero matched with a Roman counterpart and the pair concluded by a comparative essay — were explicitly designed not as political histories but as studies of character. Plutarch stated in the opening of his life of Alexander that he was writing not history but biography, concerned not with the great deeds of battles and sieges but with the small signs that reveal the character of a soul. A gesture, a witticism, a moment of generosity or temper could illuminate the whole moral configuration of a life more surely than any account of military strategy. This insistence that the details of personal conduct are educationally significant — that how people treat subordinates, respond to flattery, bear misfortune, and manage appetite reveals more about them than their public achievements — defined a tradition of moral exemplary literature that shaped European education from the Renaissance humanism of Erasmus through Rousseau's reading programmes and into modern character education.

The architectural decision to pair a Greek with a Roman in each set of lives was itself a pedagogical innovation with wide implications. By placing Alexander alongside Caesar, or Demosthenes alongside Cicero, Plutarch invited readers into a practice of comparative ethical reasoning: both figures displayed similar virtues (military courage, rhetorical gifts, political ambition) and similar vices (vanity, susceptibility to flattery), but the comparison revealed how the same dispositional material could produce differently weighted outcomes depending on political context, cultural tradition, and historical circumstance. This comparative method modelled for the reader a form of moral intelligence that is empirical and contextual rather than merely deductive from abstract principles — a way of developing practical wisdom by examining how admirable and flawed human beings have actually navigated the demands of public and private life. The survival of the Lives in Renaissance Europe made them the standard curriculum text for the education of statesmen and princes, and their influence on Shakespeare's Roman plays, on Rousseau's formation of Émile, and on Emerson's conception of representative men illustrates the extraordinary durability of Plutarch's educational vision.

Plutarch's Moralia — a collection of seventy-eight essays and dialogues ranging across topics including the education of children, the proper listening to lectures, table-talk, the control of anger, the nature of Eros, the face on the moon, and the meaning of the Delphic oracle — constitute a comprehensive programme for the cultivation of character across the whole of life. His essay “On the Education of Children” (the authenticity of which has been debated but whose ideas are consistent with the rest of the Moralia) argues that character is formed by the interaction of nature, reason, and habit, and that education properly understood is the sustained work of forming rational, virtuous dispositions — not the transmission of information but the shaping of the whole person. His essay “On Listening to Lectures” — one of the earliest texts in the history of pedagogy devoted specifically to the student's side of the educational relationship — advises young students to cultivate active, critical, and humble attention rather than passive reception, and warns against the vanity of appearing to know before one actually does.

Plutarch's philosophical position as a Platonist committed to the Academy's sceptical heritage led him to value the suspension of premature judgment as a key intellectual virtue. Against the dogmatists who claimed certainty across all domains of inquiry, Plutarch argued that honest acknowledgment of what one does not know is both epistemologically rigorous and morally admirable: intellectual honesty requires the courage to dwell in uncertainty rather than reaching for easy certainty. This disposition is evident throughout the Lives, where Plutarch frequently reports conflicting traditions, weighs different accounts, and declines to adjudicate definitively when the evidence does not permit it. The educational implication is significant: learning is not the accumulation of settled facts but the cultivation of a mind prepared to hold questions open, to follow argument wherever it leads, and to revise its conclusions in the light of new evidence or better reasoning.

For Plutarch, the ultimate aim of education is not intellectual achievement but the formation of citizens capable of contributing to the common good. The virtues that the Lives celebrate — courage, justice, temperance, wisdom, magnanimity — are consistently examined in relation to the demands of political life, and the failures of great men are traced not to errors of intellect but to failures of character: the inability to control anger, the susceptibility to flattery, the corruption that power brings in the absence of philosophical grounding. This civic orientation places Plutarch firmly within the tradition of Greek paideia, in which education is the formation of the free man as a political being, but it also anticipates the Renaissance humanist ideal of the vir civilis — the learned man whose erudition is placed at the service of the city. His insistence that private virtue and public responsibility are inseparable has continued to animate debates in character education, civic education, and the liberal arts tradition into the present day.

• Parallel Lives (c. AD 100–120; 46 surviving lives)
• Moralia (c. AD 70–120; 78 surviving essays and dialogues)