CIC 2065 Ever since St. Augustine, the Ten Commandments have occupied a predominant place in the catechesis of baptismal candidates and the faithful. In the fifteenth century, the custom arose of expressing the commandments of the Decalogue in rhymed formulae, easy to memorize and in positive form. They are still in use today. The catechisms of the Church have often expounded Christian morality by following the order of the Ten Commandments.