Holy Orders is the sacrament by which a man is made a bishop, a priest, or a deacon, and thus dedicated to be an image of Christ. A bishop is the minister of this sacrament. Ordination as a bishop confers the fullness of the sacrament, making the bishop a member of the body of successors of the Apostles, and giving him the mission to teach, sanctify, and guide, along with the care of all the Churches. Ordination as a priest configures the priest to Christ the Head of the Church and the one essential High Priest, and conferring on him the power, as the bishops' assistant, to celebrate the sacraments and other liturgical acts, especially the Eucharist. Ordination as a deacon configures the deacon to Christ the Servant of All, placing him at the service of the bishop, especially in the Church's exercising of Christian charity towards the poor and preaching of the word of God.
Aspirants to the priesthood are required by canon law (canon 1032 of the Code of Canon Law) to go through a seminary program that includes, as well as graduate level philosophical and theological studies, a formation program that includes spiritual direction, retreats, apostolate experience, etc. The course of studies in preparation for ordination as a permanent deacon is decided by the episcopal conference concerned.
Matrimony, or Marriage, like Holy Orders, is a sacrament that consecrates for a particular mission in building up the Church, and that provides grace for accomplishing that mission. This sacrament, seen as a sign of the love uniting Christ and the Church, establishes between the spouses a permanent and exclusive bond, sealed by God. Accordingly, a marriage between baptized persons, validly entered into and consummated, cannot be dissolved. The sacrament confers on them the grace they need for attaining holiness in their married life and for responsible acceptance and upbringing of their children. As a condition for validity, the sacrament is celebrated in the presence of the local Ordinary or Parish Priest or of a cleric delegated by them (or in certain limited circumstances a lay person delegated by the diocesan Bishop with the approval of the Episcopal Conference and the permission of the Holy See) and at least two other witnesses, though in the theological tradition of the Latin Church the ministers of the sacrament are the couple themselves. For a valid marriage, a man and a woman must express their conscious and free consent to a definitive self-giving to the other, excluding none of the essential properties and aims of marriage. If one of the two is a non-Catholic Christian, their marriage is licit only if the permission of the competent authority of the Catholic Church is obtained. If one of the two is not a Christian (i.e. has not been baptized), the competent authority's dispensation is necessary for validity.