The canon law of the Roman Catholic Church requires that clerics "observe perfect and perpetual continence for the sake of the kingdom of heaven". For this reason, priests in Roman Catholic dioceses make vows of celibacy at their ordination, thereby agreeing to remain unmarried and abstinent throughout their lives. The 1961 document entitled Careful Selection and Training of Candidates for the States of Perfection and Sacred Orders stated that homosexual men should not be ordained. In 2005, the Church clarified that men with "deeply rooted homosexual tendencies" cannot be ordained. The Vatican followed up in 2008 with a directive to implement psychological screening for candidates for the priesthood. Conditions listed for exclusion from the priesthood include "uncertain sexual identity" and "deep-seated homosexual tendencies". Church directives Careful Selection and Training of Candidates (1961) The 1961 document entitled Careful Selection and Training of Candidates for the States of Perfection and Sacred Orders stated that homosexual men should not be ordained. Instruction Concerning the Criteria for the Discernment of Vocations (2005) In November 2005, the Vatican completed an Instruction Concerning the Criteria for the Discernment of Vocations with regard to Persons with Homosexual Tendencies in view of their Admission to the Seminary and to Holy Orders. Publication was made through the Congregation for Catholic Education. According to the new policy, men with "transitory" homosexual leanings may be ordained deacons following three years of prayer and chastity. However, men with "deeply rooted homosexual tendencies" or who are sexually active cannot be ordained. No new moral teaching was contained in the instruction: the instruction proposed by the document was rather towards enhancing vigilance in barring gay men from seminaries, and from the priesthood. As the title of the document indicates, it concerned exclusively candidates with homosexual tendencies, and not other candidates. The Catechism distinguishes between homosexual acts and homosexual tendencies. Regarding acts, it teaches that Sacred Scripture presents them as grave sins. The Tradition has constantly considered them as intrinsically immoral and contrary to the natural law. Consequently, under no circumstance can they be approved. ... In the light of such teaching, this Dicastery, in accord with the Congregation for Divine Worship and the Discipline of the Sacraments, believes it necessary to state clearly that the Church, while profoundly respecting the persons in question, cannot admit to the seminary or to holy orders those who practise homosexuality, present deep-seated homosexual tendencies or support the so-called