Thinkers

Peter Abelard

Scholastic · Europe · 1079 to 1142

French teacher who held that right and wrong lie in a person's intention, and who urged questioning of authority.

What it is

Peter Abelard (1079 to 1142) was a philosopher and theologian of the twelfth century, and one of the great logicians of the Middle Ages. He was born in Le Pallet in Brittany, in what is now France, gave up his inheritance and a knight's career to study philosophy, and became one of the most famous teachers of his time. He is remembered for his view that the worth of an act lies in the intention behind it, for his habit of setting authorities against each other, and for his love story with Héloïse.

He studied logic under Roscelin and William of Champeaux and quarrelled with both. Around 1113 he went to Anselm of Laon to study theology, found the teaching unsatisfying, and returned to Paris to teach on his own. There he took on a pupil, Héloïse. They fell in love and married in secret. Her uncle Fulbert had Abelard attacked and castrated, and Abelard entered the monastery of Saint-Denis while Héloïse became a nun. He went on to teach again, to write on logic, theology and ethics, and to compose hymns. His books were condemned more than once, and he died in 1142.

The main ideas

• Universals are words. When we call many different things red, the general word is what they share, not some thing that exists apart from them. He held that only individual things exist and that general terms are names we apply to many of them. This is why he is counted among the founders of nominalism.
• Intention decides. The moral worth of an act lies in the intention of the person who does it, not in the deed or in what follows. The wrong is in agreeing to a bad desire, not in having the desire.
• Yes and No. In Sic et non he gathered quotations from the early Church writers that seem to contradict each other, arranged under 158 questions. He did not hide the clashes. His preface gave rules for sorting them out: look for words used in different senses, read the context, draw distinctions.
• Logic applied to faith. He believed that reasoning could clarify what the faith claims, even about hard subjects such as the Trinity. His critics thought this approach improper for such subjects.
• A philosophy of language. Alongside his logic he worked out his own account of how words carry meaning.

What it looks like in practice

Picture someone who carries a message to a neighbour in good faith, and the message turns out to cause harm she could not have foreseen. Abelard would ask first what she meant to do and whether she was careless. If she acted in good faith and was not negligent, he would not blame her, however bad the outcome. This is an illustration of the kind of question he asked, not a passage from his writing.

Books and moments

• Historia calamitatum ("The Story of My Troubles") is a letter in which he tells much of his own life.
• Sic et non ("Yes and No") collects conflicting authorities and explains how to read them.
• Theologia is his work on the Trinity. A council at Soissons condemned it and it was burned. Accounts differ by a year on when this happened.
• Letters with Héloïse survive, and she later led the Paraclete, a community of nuns for which he wrote hymns.
• Sens, 1140. A council condemned his teaching again, after his dispute with Bernard of Clairvaux, who objected to using logic on matters of faith.

Questions and criticism

• Intention alone. If only intention counts, it is fair to ask how far good intentions can excuse harm, and how we tell negligence from honest mistake.
• Method or doctrine. His critics attacked both his conclusions and his way of reasoning about faith. It is fair to ask which of the two they were really condemning.
• Words and things. If universals are only words, one may ask what makes it right to apply the same word to different things.

Close neighbours

The page on Boethius covers a thinker whose logical works were part of the old logic that Abelard read and commented on. The pages on Ockham and Aquinas cover two later medieval thinkers, for comparison.

Written by epchē in our own words, and checked against independent sources on 29 October 2026. The sources are listed below.

Who they connect to

Influenced

• Thomas Aquinas · Aquinas used the later method of setting opposing authorities side by side. (scholars disagree about this link)

Other Scholastic thinkers

• Anselm of Canterbury · 1033 to 1109
• Roger Bacon · 1220 to 1292
• Bonaventure · 1221 to 1274
• Thomas Aquinas · 1225 to 1274
• Meister Eckhart · 1260 to 1328
• John Duns Scotus · 1266 to 1308
• William of Ockham · 1287 to 1347
• Francisco Suarez · 1548 to 1617

Sources we used

• Peter Abelard · Stanford Encyclopedia of Philosophy, read on 29 October 2026
• Abelard, Peter · Internet Encyclopedia of Philosophy, read on 29 October 2026
• Peter Abelard · Encyclopaedia Britannica, read on 29 October 2026