8 The spiritual training should be closely connected with the doctrinal and pastoral, and, with the special help of the spiritual director, should be imparted in such a way that the students might learn to live in an intimate and unceasing union with the Father through His Son Jesus Christ in the Holy Spirit. Conformed to Christ the Priest through their sacred ordination they should be accustomed to adhere to Him as friends, in an intimate companionship, their whole life through. They should so live His paschal mystery themselves that they can initiate into it the flock committed to them. They should be taught to seek Christ in the faithful meditation on God's word, in the active participation in the sacred mysteries of the Church, especially in the Eucharist and in the divine office, in the bishop who sends them and in the people to whom they are sent, especially the poor, the children, the sick, the sinners and the unbelievers. They should love and venerate with a filial trust the most blessed Virgin Mary, who was given as mother to the disciple by Christ Jesus as He was dying on the cross. Those practices of piety that are commended by the long usage of the Church should be zealously cultivated; but care should be taken lest the spiritual formation consist in them alone or lest it develop only a religious affectation. The students should learn to live according to the Gospel ideal, to be strengthened in faith, hope and charity, so that, in the exercise of these practices, they may acquire the spirit of prayer, learn to defend and strengthen their vocation, obtain an increase of other virtues and grow in the zeal to gain all men for Christ.
Source: Optatam Totius (Vatican.va)