56 In union with Christ take your stand as suppliants before the Heavenly Father and allow that prayer to rise to Him from your lips again and again, which has been especially appropriate to apostolic men in every age: "hallowed by Thy name; Thy will be done on earth, as it is in heaven"! Only then shall we be influenced solely by the honor of God and by zeal to give Him greater glory, when we earnestly desire the restoration of His Kingdom - the Kingdom of justice, of love, and of peace--throughout all the world. Sincere and heartfelt eagerness to promote the missionary labors of the Church, when it is united with a burning charity for one's neighbor, is surely zeal for God's glory. For by it help is given to apostolic workers who are in a special way God's heralds and precursors.
Source: Fidei Donum (Vatican.va)