33 As to those who mean to take part in public affairs, they should avoid with the very utmost care two criminal excesses: so-called prudence and false courage. Some there are, indeed, who maintain that it is not opportune boldly to attack evil - doing in its might and when in the ascendant, lest, as they say, opposition should exasperate minds already hostile. These make it a matter of guesswork as to whether they are for the Church or against her, since on the one hand they give themselves out as professing the Catholic faith, and yet wish that the Church should allow certain opinions, at variance with her teaching, to be spread abroad with impunity. They moan over the loss of faith and the perversion of morals, yet trouble themselves not to bring any remedy; nay, not seldom, even add to the intensity of the mischief through too much forbearance or harmful dissembling. These same individuals would not have any one entertain a doubt as to their good will towards the holy see; yet they have always a something by way of reproach against the supreme Pontiff.
Source: Sapientiae Christianae (Vatican.va)