Catholic theology is the understanding of Catholic doctrine or teachings, and results from the studies of theologians. It is based on canonical scripture, and sacred tradition, as interpreted authoritatively by the magisterium of the Catholic Church. This article serves as an introduction to various topics in Catholic theology, with links to where fuller coverage is found. Major teachings of the Catholic Church discussed in the early councils of the church are summarized in various creeds, especially the Nicene (Nicene-Constantinopolitan) Creed and the Apostles' Creed. Since the 16th century the church has produced catechisms which summarize its teachings; in 1992, the Catholic Church published the official Catechism of the Catholic Church.The Catholic Church understands the living tradition of the church to contain its doctrine on faith and morals and to be protected from error, at times through infallibly defined teaching. The church believes in revelation guided by the Holy Spirit through sacred scripture, developed in sacred tradition and entirely rooted in the original deposit of faith. This developed deposit of faith is protected by the "magisterium" or College of Bishops at ecumenical councils overseen by the pope, beginning with the Council of Jerusalem (c. AD 50). The most recent was the Second Vatican Council (1962 to 1965); twice in history the pope defined a dogma after consultation with all the bishops without calling a council. Formal Catholic worship is ordered by means of the liturgy, which is regulated by church authority. The celebration of the Eucharist, one of seven Catholic sacraments, is the center of Catholic worship. The church exercises control over additional forms of personal prayer and devotion including the Rosary, Stations of the Cross, and Eucharistic adoration, declaring they should all somehow derive from the Eucharist and lead back to it. The church community consists of the ordained clergy (consisting of the episcopate, the priesthood, and the diaconate), the laity, and those like monks and nuns living a consecrated life under their constitutions. According to the Catechism, Christ instituted seven sacraments and entrusted them to the Catholic Church. These are Baptism, Confirmation (Chrismation), the Eucharist, Penance, the Anointing of the Sick, Holy Orders and Matrimony. Source: Wikipedia (en)