12 Can We be aught but deeply anxious as We behold from the heights of this Apostolic See the gravity of the questions that are being debated there with regard to the manner of spreading the Christian way of life and its deeper cultivation, as well as the great scarcity of apostolic laborers to undertake the many important tasks that are waiting to be done? These are the cares and anxieties that We have been wishing to share with you, Venerable Brethren. If your response is prompt and eager, it may happily come to pass that the hearts of the many hardworking apostles already in the field will be encouraged to hope anew for better things.
Source: Fidei Donum (Vatican.va)