The Sacrament of Holy Orders
"Holy Orders is the sacrament through which the mission entrusted by Christ to his apostles continues to be exercised in the Church until the end of time…It includes three degrees of order: episcopate, presbyterate, and diaconate" (CCC 1536). Deacons, priest and bishops are essential to the Catholic Church because we believe that they continue the work begun by the apostles.
God calls all of us to serve and be disciples, and we answer this call through the sacrament of Baptism. Catholics believe that some are then called to serve in a concentrated way through the Religious Life. Holy Orders are for those men who are called to serve in this way through the Permanent Diaconate, the Priesthood or the Episcopacy. They are “ordained” to serve. Women who are called will serve and join religious communities, and will take on the vows and charisms of that specific community, but they are not ordained within those community.
The Church confers the sacrament of Holy Orders only on baptized men (viri), whose suitability for the exercise of the ministry has been duly recognized. Church authority alone has the responsibility and right to call someone to receive the sacrament of Holy Orders. (CCC 1598)
In the Latin Church the sacrament of Holy Orders for the presbyterate (priests) is normally conferred only on candidates who are ready to embrace celibacy freely and who publicly manifest their intention of staying celibate for the love of God's kingdom and the service of men. (CCC 1599)