A hinge for the moral life
The cardinal virtues are four qualities of character that medieval writers treated as the foundation of a good life: prudence, justice, temperance and fortitude. The word “cardinal” comes from the Latin cardo, meaning hinge. Other good habits were thought to turn on these four the way a door turns on its hinge.
This article gives the background: where the idea came from, how it entered Christian thought, and how it fit alongside other virtues. Each virtue in practice, with examples, is the subject of a separate article on prudence and temperance and their companions.
Classical origins
The idea of grouping virtues into a small core appears in ancient Greek philosophy. Plato’s Republic describes a good city and a good soul in terms of four qualities, often translated as wisdom, courage, moderation and justice. Aristotle analyzed virtues in greater detail, treating them as habits formed by practice, and distinguished moral virtues from intellectual ones. Stoic philosophers developed their own versions, and Cicero carried the scheme into Latin in works that were read for centuries.
Medieval readers rarely knew Greek philosophy first-hand in the early period. They received this inheritance mainly through Latin authors such as Cicero, Seneca and Macrobius, through Christian fathers, and, from the twelfth and thirteenth centuries, through newly translated works of Aristotle.
Christian adoption
Early Christian writers had a problem. The four virtues belonged to pagan philosophers, yet Christians were told to love God and neighbor, not merely to be moderate and brave. Ambrose of Milan in the fourth century reworked Cicero’s ideas for a Christian audience, and he is traditionally credited with applying the term cardinal to the four. Augustine reinterpreted them as forms of love, for example reading temperance as love keeping itself whole for God and fortitude as love bearing hardship willingly. Gregory the Great also taught the four widely.
The result was a durable bridge between classical ethics and Christian teaching. It allowed medieval thinkers to honor ancient wisdom without giving up their own beliefs, although they sometimes disagreed about how much non-Christians could truly practice virtue. The question echoes the discussion of reason and faith found in medieval philosophy.
The theological virtues
The second major step was to add three virtues from the New Testament. Paul’s first letter to the Corinthians names faith, hope and love, with love, or charity, as the greatest. Medieval teachers called these the theological virtues, because they were considered to be given directly by God and aimed at God as their object.
Combining the four with the three produced a list of seven, a number medieval writers loved for its symbolic weight. This is where the idea of the seven virtues begins, as the mirror of the seven deadly sins.
Thomas Aquinas organized the scheme especially clearly in the thirteenth century. In his view, the cardinal virtues perfect human nature and could be developed through practice, while the theological virtues exceed natural ability and require grace. He also argued that the cardinal virtues, when infused by grace, take on a deeper character than their purely natural versions. Thinkers disagreed on how neatly the natural and the supernatural could be separated, but the overall pattern stuck.
How the virtues were used
Medieval writers used the four in several settings.
- Teaching and sermons. Preachers could describe a good life with a simple, memorable framework. Handbooks for confessors used the virtues to sort questions of conduct.
- Advice for rulers. Mirrors for princes, which were treatises advising kings, regularly urged rulers toward prudence and justice in particular. Ideas of the good ruler are therefore tied to the way medieval kingship was imagined.
- Art and architecture. The virtues were personified as female figures in sculpture and painting. Cathedral portals, tombs and civic paintings sometimes included them, a form of allegory that made abstract qualities visible. Italian civic art, for example, used virtues to represent good government.
- Literature. Poets used virtues and vices as characters or as the structure of a journey. Dante’s Divine Comedy includes the cardinal virtues in its imagery and structure, reflecting how familiar the scheme was to educated readers.
Variations and cautions
The standard scheme was not completely fixed. Wisdom and prudence were sometimes distinguished and sometimes merged. Some authors added other virtues, such as humility or obedience, to lists for monks. The seven-virtue scheme popular in some modern sources, with items like chastity, diligence and kindness, comes from a different tradition of virtues set against specific vices. Those variations are best treated as related but separate lists, not as the cardinal virtues.
It is also worth being careful about how much the virtues shaped actual behavior. They were an ideal vocabulary, and surviving texts show what teachers wished people to be. People in practice faced competing duties of family, rank and survival, and no scheme of four virtues could settle every decision. Still, the cardinal virtues gave medieval Europe a shared language for talking about character, one that continued far beyond the Middle Ages.