Come after Me and I will make you fishers of men.
Matthew 4:19
 

"Through the ordained ministry, especially that of bishops and priests, the presence of Christ as head of the Church is made visible in the midst of the community of believers. In the beautiful expression of St. Ignatius of Antioch, the bishop is typos tou Patros: he is like the living image of God the Father."

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Catechism of the Catholic Church, 1549

Read more here:
Catechism on Holy Orders