40 And so, Venerable Brethren, since you are most intimately associated with Christ and His Vicar upon earth, inspired by a burning charity be zealous to share that solicitude for all the churches, which lies heavy upon Our shoulders. Urged by the charity of Christ, may you realize that you are closely bound to Us in the pressing duty of spreading the Gospel and building up the Church throughout the whole world!
Source: Fidei Donum (Vatican.va)