53 Our immediate predecessor exhorted the bishops "with the same affectionate interest that shares work with others in fraternal harmony and excludes all selfish considerations" to provide for the spiritual assistance of young Catholics who come to their dioceses from mission countries to study and to acquire the necessary experience for assuming leadership in their own nations. (83) All of you, Venerable Brethren, are aware of the intellectual and moral dangers to which they will be exposed in a society which is not only different from their own but also, alas, may be unfavorable ground for the growth of their Faith, and not capable of attracting them to the practice of Christian virtue. Each one of you, moved by the missionary spirit which is a conscientious duty of all pastors, will meet this situation with the greatest charity and zeal, using the most suitable means. It will not be difficult for you to find these students and entrust them to the care of priests and laymen who are equipped for this task. It should not be difficult to assuage their spiritual needs, and, last but not least, to have them experience the sweet consolations of Christian charity in which we are all brothers, ministering to one another's welfare. Therefore, to the many kinds of help which you are now giving the missions, add this particular one, which brings close to your hearts those regions of the world which, although far away, are entrusted to your care.
Source: Princeps Pastorum (Vatican.va)