Yet (a person) must respond to God Who calls, and that in such a way, that without taking counsel with flesh and blood (Gal. 1:16), he (or she) devotes (her or) himself wholly to the work of the Gospel. This response, however can only be given when the Holy Spirit gives His inspiration and His power. For (the one) who is sent enters upon the life and mission of Him Who “emptied Himself, taking the nature of a slave” (Phil. 2:7). Therefore, (a person) must be ready to stay at (a) vocation for an entire lifetime, and to renounce …self and all those whom … thus far considered as (her or) his own, and instead to “make (one)self all things to all (people)” (1 Cor. 9:22).
I think the principle of a lifelong vocation to missionary work can be called into question. This is not to deny that some people indeed possess the charism to be a lifelong missioner, just as they might be called to music, catechesis, administration, or any other field of ministry. The attempt to put all missionary labors on a par with a lifelong commitment as a priest–this seems narrow-minded to me. And indeed, the post-conciliar time has seen many temporary mission involvement opportunities for young people. The council bishops might well have conceded that Saint Paul may be the more radical example of that ministry, and recognize that perhaps, the missionary calling is not necessarily on a par with the forever-priesthood of Melchizedek.
Announcing the Gospel to all nations, (she or) he confidently makes known the mystery of Christ, whose ambassador (she or) he is, so that in him (she or) he dares to speak as (she or) he ought (cf. Eph. 6:19; Acts 4:31), not being ashamed of the scandal of the Cross. Following in his Master’s footsteps, meek and humble of heart, (the missioner) proves that His yoke is easy and His burden light (Matt. 11:29ff.) By a truly evangelical life, in much patience, in long – suffering, in kindness, in unaffected love (cf. 2 Cor. 6:4ff.), (the missioner) bears witness to his Lord, if need be to the shedding of (her or) his blood. (The missioner) will ask of God the power and strength, that (she or) he may know that there is an overflowing of joy amid much testing of tribulation and deep poverty (2 Cor. 8:2). Let (missioners) be convinced that obedience is the hallmark of the servant of Christ, who redeemed the human race by His obedience.
The heralds of the Gospel lest they neglect the grace which is in them, should be renewed day by day in the spirit of their mind (cf. 1 Tim. 4:14; Eph. 4:23; 2 Cor. 4:16). Their Ordinaries and superiors should gather the missionaries together from time to time, that they be strengthened in the hope of their calling and may be renewed in the apostolic ministry, even in houses expressly set up for this purpose.