A relic is an object kept in tribute to a holy person. Some relics are body parts such as bone chips or teeth. Others are items once belonging to the person, most often snips of clothing. Catholics aren’t alone in collecting relics. Other religions like Buddhism employ them. People of faith backgrounds that permit it keep cremains of loved ones in an urn on the mantle (See here for Vatican instruction on Catholic burial, cremation). I have a shirt that belonged to my dad, which I still wear. Relics are a traditional way of keeping in touch with someone special.

Catholic relics are as old as the church. Martyrdom was a frequent if not typical cause of Christian death. The faithful collected the martyrs’ remains, often in pieces, for secret burial in places like catacombs. When available, the instrument of death was spirited off as well. Think: relics from the True Cross. Christians gathered at martyrs’ tombs to celebrate Eucharist. When the persecutions finally ceased, churches were erected on the gravesites. Christians considered burial near a martyr a privilege. A tug-of-war over these bodies became typical; some were exhumed and re-interred on the properties of those who could afford it. In the Middle Ages, Crusaders pilfered lots of relics and carried them to Europe.

Relics were catechetically useful. They spurred interest in the saint whose virtues might be imitated. In 410, a council in Carthage ruled that saints’ shrines had to contain authentic relics or be destroyed. In 767, a Nicaean council determined that every altar must contain a relic or Mass could not be celebrated on it. This decree echoes the original practice of celebrating Mass on the graves of martyrs and is upheld in current canon law (no.1237). Exceptions are made today for portable altars such as those used in wartime.

Selling relics has always been forbidden. Church law says significant relics can’t even be moved around without express permission from the Vatican (no. 1190).

Attributing magical powers to such items is considered an abuse, but the tendency to be superstitious about holy objects is not unknown in the modern church. From the Holy Grail to the Shroud of Turin, the curious and the credulous will always find a less than edifying fascination with such objects. Church teaching draws a distinction between proper and improper veneration. Worship belongs to God alone. Even if a saint should appear suddenly in an apparition, human honor is the limit of our tribute.

Scripture: The Bible regards holiness as a divine attribute communicable to people, places, and things (e.g. Moses’ shining face, the Ark and its sacred utensils, the Temple’s Holy of Holies.) The topic of relics, specifically, is not treated. But see 2 Kings 13:20-21; Mark 5:25-34; Acts 5:12-15

Books: Saints Preserved: An Encyclopedia of Relics – Thomas Craughwell (New York: Image Books, 2011)

Holy Bones, Holy Dust: How Relics Shaped the History of Medieval Europe – Charles Freeman (New Haven: Yale University Press, 2012)

The fixed sanctuary of meeting between God and mortals is an old concept. Your instinct is correct that creation seems perfect for the job. Sacred space is meant to display the cosmos in miniature: a unified center where heaven, earth, and the underworld intersect. Just as mountains reach into the heavens, and roots push deep into the soil, the holy place conjoins the three anciently acknowledged realms. The achievement of this unity is evident in the designs of temples, cathedrals, pyramids, ziggurats, pagodas, monoliths, and even the towering sacred trees venerated in northern lands.

As in many religions, the Judeo-Christian tradition regards this design as divinely supplied. So Moses gets the blueprint for a sanctuary from God at Sinai, as does King Solomon for the Jerusalem temple. Ezekiel receives a revitalized one in a vision after the first temple is destroyed. John at Patmos envisions the Lamb as an incarnate temple in the reign of God at the end of time. In these episodes (which have parallels across ancient cultures), the leader or seer is given precise measurements for the job, including careful attention to the worship space’s orientation toward nature’s four directions and often including a source of living water. Other traditions incorporate architectural elements to interact with the sun and moon, and the seasonal calendar. The design of sacred space always acknowledges the superiority of God’s world design and is not intended to replace it, but rather to celebrate it.

Attention is likewise paid to the meaning of creation, and not just its patterns. The story of creation—again, in our biblical tradition and in other world religions—is a triumph of divine order over primordial chaos. Sacred geometry is therefore strictly observed in these designs, which explains the astonishing exactness of many structures from antiquity, as well as the patience of builders who begin a cathedral which none of them will see completed.

The word temple means "to be cut from": to be separate from ordinary use and reserved for sacred encounter. Our word contemplate reflects the understanding that contemplation is an activity enhanced by the temple, and also that the temple’s mysteries ideally reside inside the worshipper as well as around him or her. Jesus epitomized this understanding when he identified his own body with the Jerusalem temple. Paul repeated this teaching when he called each believer a temple. The more we consider sacred space, the more it can teach us.

Scripture: Genesis 28:10-22; Exodus 25-31; 1 Kings 5:15-7:51; Isaiah 28:16; Ezekiel 40-47:12; Matthew 16:18; John 2:13-22; 1 Corinthians 3:16-17; Revelation 21:22-22:5

Books: The Temple: Meeting Place of Heaven and Earth – John Lundquist (London: Thames & Hudson, 2012)

How to Read a Church: A Guide to Symbols and Images in Churches and Cathedrals – Richard Taylor (Mahwah, NJ: Paulist Press/HiddenSpring, 2005)