of their new obedience; and by renewing the exercise of these graces, by serious meditation, and fervent prayer." Therefore, the Presbyterian Church in America's Directory for the Worship of God advises that a week's notice be given to the congregation prior to the administration of the Lord's supper: "It is proper that public notice should be given to the congregation, at least the Sabbath before the administration of this ordinance, and that, either then, or on some day of the week, the people be instructed in its nature, and a due preparation for it, that all may come in a suitable manner to this holy feast." The Westminster Larger Catechism also provides extensive instructions on "what is required of them that receive the sacrament of the Lord's supper" during and after its administration. Sedevacantist practice Sedevacantists are people who identify as Catholic and hold that the present occupier of the Holy See is not the pope due to the mainstream church's espousal of what they see as heresies of modernism and that, for lack of a valid pope, the See has been vacant since the death of Pope Pius XII in 1958, the death of Pope John XXIII in 1963, the death of Pope Paul VI in 1978, or since the first alleged publicly proclaimed heresy by Paul VI, or what they view as some other failure of the true Church to appoint a valid pontiff. Sedevacantists often hold concerns regarding perceived departures from dogmatic pronouncements and changes to ecclesiastical discipline since the Second Vatican Council, leading to a difference between their fasting and abstinence practices and that of the Catholic Church. The Congregation of Mary Immaculate Queen (CMRI), a Sedavacantist religious group, teaches that the Eucharistic Fast consists of means fasting from food and alcohol three hours prior to receiving Holy Communion, and though not obligatory, members of the sect are "urged to observe the Eucharistic fast" from midnight on a day until the time that they receive communion. Jansenist practice Jansenists were a theological group part of the Roman Catholic church starting in the 1600s. They believed that Holy Communion should be received very infrequently, and that reception required much more than freedom from mortal sin instead arguing that a high degree of perfection, including purification from attachment to venial sin, was necessary before approaching the sacrament of the Eucharist. See also Thanksgiving after Communion Open communion Closed