59 However We must make it clear, conscious as We are of Our apostolic duty, that your support, though gladly received, is still far from being adequate to the countless needs of the missions. We are daily appealed to and importuned for assistance by missionaries who are hard pressed to promote the welfare of the Church, to remove hindrances thereto, to build the churches so urgently needed, or to undertake various activities of the apostolate. Naturally We are sick at heart when We have to answer these just appeals with only partial and insufficient amounts.
Source: Fidei Donum (Vatican.va)