37. During this stage of preparation, frequent meetings will be necessary in an atmosphere of dialogue, friendship and prayer, with the participation of pastors and catechists. They should stress the fact that "The family celebrates the Gospel of life through daily prayer, both individual prayer and family prayer. The family prays in order to glorify and give thanks to God for the gift of life, and implores his light and strength in order to face times of difficulty and suffering without losing hope" (EV 93). Moreover, Christian married couples who are apostolically committed, in a vision of sound Christian optimism, can contribute to shedding greater light on Christian life in the context of the vocation to marriage and in the complementarity of all the vocations. Therefore, this period should not only be for theoretical study but also for formation during which the engaged, with the help of grace and by avoiding all forms of sin, will prepare to give themselves as a couple to Christ who sustains, purifies and ennobles the engagement and married life. In this way, premarital chastity takes on its full meaning and rules out any cohabitation, premarital relations, and other practices, such as mariage coutumier, in the process of making love grow.