The cross on which Jesus of Nazareth was executed by Roman crucifixion was an instrument of capital punishment for the most degraded class of criminals and enemies of the state. Within weeks of the crucifixion, the earliest disciples were proclaiming not merely that Jesus had risen but that his death had been meaningful, even salvific. Within decades, Paul was writing that the cross, which the Greek world considered foolishness and the Jewish world considered a scandal, was "the power of God, and the wisdom of God" (1 Corinthians 1:24). Within centuries, the cross had become the dominant symbol of the largest religion in the Western world.
The physical gesture of making the sign of the cross, tracing the shape of the cross on one's own body, is among the oldest Christian practices. Tertullian, writing around 200 CE, describes Christians making the sign of the cross on their foreheads as a routine practice throughout the day. The gesture became formalized as the tracing of a cross from forehead to chest, then from shoulder to shoulder, typically accompanied by the trinitarian formula "In the name of the Father, and of the Son, and of the Holy Spirit." This gesture is practiced by Catholics, Orthodox Christians, many Anglicans, and Lutherans, and has been a subject of controversy in traditions that consider it too ritualistic.
The cross entered the English language not only as a religious gesture but as a metaphor for burden, suffering, and obligation patiently borne. "Everyone has their cross to bear" derives from Jesus's instruction in Matthew 16:24 and Luke 9:23 to take up one's cross and follow him. This metaphor entered English as a description of any unavoidable personal suffering or obligation that must be accepted with endurance rather than merely resisted. A difficult family member, a chronic illness, a demanding job: these are the secular crosses of everyday English speech.
The word cross itself developed a remarkable range of meanings in English that derive from or resonate with its religious sense. To cross someone means to oppose or thwart them. Cross as an adjective means irritated or contrary. Crossroads, crossfire, cross-examination, cross-purposes: all these compounds preserve in their very structure the intersection of opposing lines that constitutes the cross's shape. The ubiquity of the cross as a spatial image, the intersection of vertical and horizontal, encoded itself in the language through dozens of compounds.
The crucifix, the cross bearing the body of Christ, generated an enormous artistic tradition from Byzantine ivories through Romanesque stone carvings to Renaissance paintings and modern sculpture. Every era of Christian culture produced its characteristic representations of the crucifixion, and each tells us something about how that era understood suffering, redemption, and the relationship between the human and the divine. The iconic paintings of the crucifixion by Velazquez, Grünewald, and Rubens represent not only religious devotion but the full range of human artistic aspiration.
In secular culture, the cross functions as a sign of Christianity but also increasingly as a generic symbol of memorial and loss. Memorial crosses at roadsides mark the sites of traffic fatalities, often erected by people with no particular religious conviction. The cross in this context means loss, grief, and memory rather than specifically Christian theology. This secular appropriation, while sometimes objected to by religious believers, demonstrates the symbol's extraordinary cultural penetration: it has become available as a general marker of human mortality and mourning beyond its specifically theological meanings.
The cross as a mathematical and visual symbol, two lines intersecting at right angles, has an existence independent of its Christian meaning but has been permanently colored by that meaning in Western culture. The plus sign (+) and the multiplication sign (x) are crosses in mathematical notation. The Swiss red cross on white background, and its inverse in the International Committee of the Red Cross flag, chose the cross as a symbol of humanitarian neutrality partly because of its universal recognizability. Cemetery crosses, crossword puzzles, and the cross-hatch symbol all participate in a visual tradition that the Christian cross has made ubiquitous.
The cross's journey from an instrument of Roman execution to the universal symbol of a world religion, and then into the general vocabulary of form and symbol, is one of the strangest and most consequential trajectories in the history of any image. What was specifically designed to be shameful, public, and deterrent became the central symbol of a movement that eventually encompassed a third of humanity.
The cross's role in heraldry, architecture, and civic symbolism illustrates its penetration beyond strictly religious contexts. Crossroads are intersections of two paths; crosswords are the intersection of words. The Swiss national flag, the Red Cross, the Union Jack, the Nordic flags of Scandinavia: all incorporate the cross as a design element. This ubiquity of the cross in the visual environment of Western civilization means that the symbol and its verbal equivalents are encountered thousands of times before most people have any occasion to reflect on their origin.