11 Towards the explanation and defence of all that we have written those Catholics can very largely contribute whose work is on the public and especially on the daily-press. Let them then remember their duty. Let them religiously and courageously defend what is true and right, the interests of the Church and of the State, and in such a way that they do not outstep the bonds of decorum, avoiding all personalities, and exceeding in nothing. Let them respect and religiously defer to the authority of the Bishops and all other legitimate authority. The more difficult the times and the more threatening the danger of division, the more they ought to strive to show the necessity of that unity of thought and action without which there is little or no chance of ever obtaining that which is the object of our common hopes.
Source: Affari Vos (Vatican.va)