An old defense of images
A famous line associated with Pope Gregory the Great, around the year 600, said that pictures are to the uneducated what writing is to those who can read. He wrote this in a letter to a bishop who had removed images from churches, arguing that images should be kept for teaching, though not worshipped. The idea was repeated for centuries and became the standard explanation of why churches should have pictures. It captures a real purpose, but it was never the whole story.
Modern historians treat the “books for the illiterate” idea with some care. Many viewers could not read Latin, which is different from not being able to read at all, and pictures were also used by people who were highly educated. Most images appear to have done several jobs at once.
Teaching
Wall paintings, windows and sculpture told stories from scripture and saints’ lives to people who might hear them in sermons. A cycle of scenes on a church wall could prompt a preacher or parent to explain events and lessons. Images of virtues and vices, and of heaven and hell, added moral instruction. The visual language involved is covered in the introduction to iconography, but the practical point is that pictures made stories memorable and often public: everyone entering the church saw the same scenes.
It helps to remember that medieval learning was heavily oral. People learned through listening, repeating and seeing, so images worked alongside speech rather than replacing text. In a world where parish education was uneven, images offered a shared reference point that did not depend on the quality of any one priest’s sermon.
Devotion and prayer
Images were also aids to prayer. A crucifix, a statue of Mary or a small painted panel could focus attention, and the faithful touched, kissed, dressed or processed with them on feast days. Private owners commissioned prayer books with pictures to accompany readings. Later medieval devotion encouraged people to imagine themselves present at events from Christ’s life, and images supplied the details needed for that kind of meditation.
Some images were believed to have special power, in connection with holy relics or particular shrines. Pilgrims traveled to see them, and shops around major sites sold small souvenirs, such as the pilgrim badges that people wore on their hats or bags. Theologians distinguished between honoring the person depicted and worshipping the image itself, a distinction that mattered in debates but was probably blurred in everyday behavior.
Memory, commemoration and display
Images served memory. Tomb effigies and memorial brasses recalled the dead and encouraged prayers for them, and donor portraits recorded who had given a gift. Coats of arms and portraits in books or on buildings announced family and rank. Wealthy patrons also used lavish art to display status: gold, expensive pigments and fine workmanship signaled wealth and piety at the same time. For a monastery or cathedral, a splendid object could be a point of pride and a way to attract support.
Not all uses were solemn. Books, furniture and tapestries also carried hunting scenes, romances, jokes and decoration with no obvious religious message.
The debate over images
The proper role of images was contested. In the Byzantine Empire, the eighth and ninth centuries saw a prolonged dispute known as iconoclasm, meaning image-breaking, in which emperors and church leaders disagreed over whether venerating icons was idolatry. Historians debate how far imperial policy, theology and politics each drove it. Icons were restored as objects of veneration in the ninth century, an event commemorated in the Orthodox Church.
In the West, the court of Charlemagne produced a response to eastern developments, the Libri Carolini, which took a cautious line: images were fine as decoration and reminders but were not to be adored. The West thus kept images while setting limits on how they should be treated.
Later criticism came from within the Church. In the twelfth century, the Cistercian leader Bernard of Clairvaux complained about fantastic carvings in monastic cloisters, asking what monsters were doing before monks trying to read and meditate. He was not rejecting images altogether but objecting to distraction and expense. In the later Middle Ages, some reformers and heretical movements, among them followers of John Wycliffe in England, questioned the cult of images; how widespread and consistent that criticism was remains discussed by scholars.
What to take from this
Images in the Middle Ages were not just decoration and not just teaching tools. They taught, moved, reminded, honored and displayed, and the same work might do all of this. The argument over their use was a debate about where to draw lines, not about whether pictures mattered, and that debate helps explain why so much medieval art survives in churches today.