In the Sacrament of Holy Orders, or Ordination, the priest being ordained vows to lead other Catholics by bringing them the sacraments (especially the Eucharist), by proclaiming the Gospel, and by providing other means to holiness.
Those who receive the sacrament of Holy Orders -- as a deacon, priest or bishop -- are consecrated in Christ's name "to feed the Church by the word and grace of God."
By virtue of our Baptism, all Christians are part of a common priesthood of believers. We are all called to participate in Christ's mission. Through the Sacrament of Holy Orders, bishops and priests are given a special role in carrying out this mission.
They exercise a ministerial priesthood. Deacons also receive a special grace through ordination and are called to assist the ministry of bishops and priests (Catechism of the Catholic Church [CCC], nos. 1547, 1554).
Pope Benedict XVI writes, "The priest is above all a servant of others" (Sacramentum Caritatis [Sacrament of Charity], no. 23). In gathering the community, modeling Christ's love for the poor, presiding at Eucharist, and evangelizing social realities, ordained ministers help Christians imitate Christ's mission of love and justice.