55 The Bishop, in his admonition to the ordinands, says: "With certain wonderful variety Holy Church is clothed, made comely and is ruled; since in her some are consecrated Pontiffs, and other priests of lesser degree, and from many members of differing dignity there is formed one Body of Christ." This obedience priests promised to the Bishop after Ordination, the holy oil still fresh on their hands. On the day of his consecration the Bishop, in his turn, swore obedience to the supreme visible Head of the Church, the successor of St. Peter, the Vicar of Jesus Christ. Let then obedience bind ever closer together these various members of the Hierarchy, one with another, and all with the Head; and thus make the Church Militant a foe truly terrible to the enemies of God, ut castrorum aciem ordinatam , "as an army set in array." Let obedience temper excessive zeal on the one hand, and put the spur to weakness and slackness on the other. Let it assign to each his place and station. These each should accept without resistance; for otherwise the magnificent work of the Church in the world would be sadly hindered. Let each one see in the arrangement of his hierarchical Superiors the arrangements of the only true Head, whom all obey: Jesus Christ, Our Lord, who became for us "obedient unto death, even to the death of the cross . "
Source: Ad Catholici Sacerdotii (Vatican.va)