Divination isn't a parlor game, and not just anyone can do it. For example, only Santeros/as who are fully initiated and who have trained to read the dilogún are able to cast the shells and do readings for clients. Many Santeros/as don't do dilogún readings (which are called consultas or registros) because dilogún reading requires extensive study and years of practice to master, similar to the way a rabbi might study the Torah. Some Santeros/as simply don't have the time, patience or interest to learn it, and some don't have that particular kind of aché (the gift, the talent or skill given by God). Babalawos, who are the priests of Orula, are among the most skilled diviners because Orula, among the Orichas, is the master diviner. Babalawos spend many years studying the odu (patterns) that can fall when they throw the epuele chain. They work under the guidance of elders and memorize vast numbers of patakis (sacred stories) and refranes (proverbs) that relate to each odu. The dilogún and the epuele chain have to be consecrated in special ceremonies, otherwise they don't have the aché to communicate with the Orichás. So, it's not just a question of going to the store, buying some shells, throwing them, and consulting a book to see what it all means. In many Lucumí communities, diviners carefully guard their knowledge of the odu because it's powerful and sacred information that shouldn't be shared with outsiders. Today, there are books on how to read the odu, but that's like giving a cookbook to someone who doesn't know how to cook, doesn't have the right tools, and doesn't know how to turn on the stove. It's only going to go so far.