79. Cooperation is expressed above all by promoting missionary vocations. While acknowledging the validity of various ways of being involved in missionary activity, it is necessary at the same time to reaffirm that a full and lifelong commitment to the work of the missions holds pride of place, especially in missionary institutes and congregations. Promoting such vocations is at the heart of missionary cooperation. Preaching the Gospel requires preachers; the harvest needs laborers. The mission is carried out above all by men and women who are consecrated for life to the work of the Gospel and are prepared to go forth into the whole world to bring salvation.

80. As I think of this serious problem, I appeal with great confidence and affection to families and to young people. Families, especially parents, should be conscious that they ought to "offer a special contribution to the missionary cause of the Church by fostering missionary vocations among their sons and daughters."167

An intense prayer life, a genuine sense of service to one's neighbor and a generous participation in Church activities provide families with conditions that favor vocations among young people. When parents are ready to allow one of their children to leave for the missions, when they have sought this grace from the Lord, he will repay them, in joy, on the day that their son or daughter hears his call.

I ask young people themselves to listen to Christ's words as he says to them what he once said to Simon Peter and to Andrew at the lakeside: "Follow me, and I will make you fishers of men" (Mt 4:19). May they have the courage to reply as Isaiah did: "Here am I, Lord! I am ready! Send me!" (cf. Is 6:8) They will have a wonderful life ahead of them, and they will know the genuine joy of proclaiming the "Good News" to brothers and sisters whom they will lead on the way of salvation.