Presbyterorum Ordinis §8

⁸ Priests by virtue of their ordination to the priesthood are united among themselves in an intimate sacramental brotherhood. In individual dioceses, priests form one priesthood under their own bishop. Even though priests are assigned to different duties, nevertheless they carry on one priestly ministry for men. All priests are sent as co-workers in the same apostolate, whether they engage in parochial or extra-parochial ministry. This is true whether they devote their efforts to scientific research or teaching, or whether by manual labor they share in the lot of the workers themselves-if there is need for this and competent authority approves-or finally whether they fulfill some other apostolic tasks or labor designed for the apostolate. All, indeed, are united in the building up of the Body of Christ which, especially in our times, requires manifold duties and new methods. It is very important that all priests, whether diocesan or religious, help one another always to be fellow workers in the truth. Each one, therefore, is united in special bonds of apostolic charity, ministry and brotherhood with the other members of this priesthood. This has been manifested from ancient times in the liturgy when the priests present at an ordination are invited to impose hands together with the ordaining bishop on the new candidate, and with united hearts concelebrate the Sacred Eucharist. Each and every priest, therefore, is united with his fellow priests in a bond of charity, prayer and total cooperation. In this manner, they manifest that unity which Christ willed, namely, that his own be perfected in one so that the world might know that the Son was sent by the Father. Older priests, therefore, should receive younger priests as true brothers and help them in their first undertakings and priestly duties. The older ones should likewise endeavor to understand the mentality of younger priests, even though it be different from their own, and follow their projects with good will. By the same token, young priests should respect the age and experience of their seniors; they should seek their advice and willingly cooperate with them in everything that pertains to the care of souls. In a fraternal spirit, priests should extend hospitality, cultivate kindliness and share their goods in common. They should be particularly solicitous for the sick, the afflicted, those overburdened with work, the lonely, those exiled from their homeland, and those who suffer persecution. They should gladly and joyfully gather together for recreation, remembering Christ's invitation to the weary apostles: "Come aside to a desert place, and rest awhile" (Mk 6:31). And further, in order that priests may find mutual assistance in the development of their spiritual and intellectual life, that they may be able to cooperate more effectively in their ministry and be saved from the dangers of loneliness which may arise, it is necessary that some kind of common life or some sharing of common life be encouraged among priests. This, however, may take many forms, according to different personal or pastoral needs, such as living together where this is possible, or having a common table, or at least by frequent and periodic meetings. One should hold also in high regard and eagerly promote those associations which, having been recognized by competent ecclesiastical authority, encourage priestly holiness in the ministry by the use of an appropriate and duly approved rule of life and by fraternal aid, intending thus to do service to the whole order of priests. Finally, by reason of the same communion in the priesthood, priests should realize that they are obliged in a special manner toward those priests who labor under certain difficulties. They should give them timely help, and also, if necessary, admonish them discreetly. Moreover, they should always treat with fraternal charity and magnanimity those who have failed in some matters, offer urgent prayers to God for them, and continually show themselves as true brothers and friends.