15 More prudent than the children of light, they have been daring in their enterprises; inferior in numbers, but superior in cunning and in riches, they have soon succeeded in lighting up amongst us a great conflagration of evils. May all the friends of Catholicity now, at least, understand that it is time to make some daring effort, and to rouse themselves at any cost from a languid carelessness, for one is never more easily overcome than in the sleep of cowardly security. Let them behold how the noble courage of their ancestors knew no fear and no repose; how by their indefatigable labours, and at the price of their blood, the Catholic Faith has grown and spread in the world.
Source: Etsi Nos (Vatican.va)