104 Priests should also be mindful that they are more than public dignitaries; they are sacred ministers. And so, as they work to bring God's light to the minds of men, to redirect the wills of sinners with heaven's help and with brotherly love, as they work to advance and spread the peace-bringing kingdom of Jesus Christ, they must never think that there is a fixed limit to their time and belongings, their expenditures, or of their personal inconvenience. They must seek God's grace in humble and ceaseless prayer, and they must rely on this grace far more than on their own toil and labor.
Source: Ad Petri Cathedram (Vatican.va)