Vatican Council. In Eastern Catholic Churches, a monastic archimandrite may tonsure and institute his subjects to minor orders; however, the tonsure and minor orders are not considered to be part of the sacrament of holy orders. The sacrament of Confirmation is normally administered by a bishop in the Latin Church, but a bishop may delegate the administration to a priest. In the case of receiving an adult into full communion with the Catholic Church the presiding priest will administer Confirmation. In the Eastern Catholic Churches, Confirmation (called Chrismation) is normally administered by priests as it is given at the same time as baptism. It is only within the power of the diocesan or eparchial bishop to bless churches and altars, although he may delegate another bishop, or even a priest, to perform the ceremony. On Holy Thursday Latin Catholic bishops preside over the Mass of the Chrism. Though Oil of the Sick for the sacrament of Anointing of the Sick is blessed at this Mass, it may also be blessed by any priest in case of necessity. Only a bishop may consecrate Chrism. In the Eastern Catholic Churches chrism is consecrated solely by heads of churches sui juris (patriarchs and metropolitans) and diocesan bishops may not do so. Only a bishop or other ordinary may grant nihil obstats for theological books, certifying that they are free from doctrinal or moral error; this is an expression of the teaching authority, and education responsibility of the bishop. Prior to the Second Vatican Council, it was also the prerogative of the bishop to consecrate the paten and chalice that would be used during the Mass. One of the changes implemented since the council, is that a simple blessing is now said, and it may be given by any priest. Canonical authority In both Western and Eastern Catholic churches, any priest can celebrate the Mass or Divine Liturgy. In order to offer Mass or Divine Liturgy publicly, however, a priest is required to have permission from the local Ordinary—authority for this permission may be given to pastors of parishes for a limited period, but for long-term permission recourse to the diocesan bishop is usually required. A celebret may be issued to travelling priests so that they can demonstrate to pastors and bishops outside of their own diocese that they are in good standing. However, even if a priest does not possess such a document,