“There they (Paul and Barnabas) strengthened the souls of the disciples and encouraged them to continue in the faith, saying, “It is through many persecutions that we must enter the kingdom of God.” And after they had appointed elders for them in each church, with prayer and fasting they entrusted them to the Lord in whom they had come to believe.”
The spiritual gift conferred by presbyteral ordination is expressed by this prayer of the Byzantine Rite. The bishop, while laying on his hand, says among other things: Lord, fill with the gift of the Holy Spirit him whom you have deigned to raise to the rank of the priesthood, that he may be worthy to stand without reproach before your altar to proclaim the Gospel of your kingdom, to fulfill the ministry of your word of truth, to offer you spiritual gifts and sacrifices, to renew your people by the bath of rebirth; so that he may go out to meet our great God and Savior Jesus Christ, your only Son, on the day of his second coming, and may receive from your vast goodness the recompense for a faithful administration of his order.
This priesthood is ministerial. “That office . . . which the Lord committed to the pastors of his people, is in the strict sense of the term a service.” It is entirely related to Christ and to men. It depends entirely on Christ and on his unique priesthood; it has been instituted for the good of men and the communion of the Church. The sacrament of Holy Orders communicates a “sacred power” which is none other than that of Christ. The exercise of this authority must therefore be measured against the model of Christ, who by love made himself the least and the servant of all. “The Lord said clearly that concern for his flock was proof of love for him.”
Catechism of the Catholic Church #1587, #1551