33 It is Our wish that the greatest fruits should be gained from this solemn Centenary by those Catholics who as journalists and writers expound, spread, and defend the doctrines of the Church. It is necessary that they, in their writings, imitate and exhibit at all times that strength joined always to moderation and charity, which was the special characteristic of St. Francis. He, by his example, teaches them in no uncertain manner precisely how they should write. In the first place, and this the most important of all, each writer should endeavor in every way and as far as this may be possible to obtain a complete comprehension of the teachings of the Church. They should never compromise where the truth is involved, nor, because of fear of possibly offending an opponent, minimize or dissimulate it. They should pay particular attention to literary style and should try to express their thoughts clearly and in beautiful language so that their readers will the more readily come to love the truth. When it is necessary to enter into controversy, they should be prepared to refute error and to overcome the wiles of the wicked, but always in a way that will demonstrate clearly that they are animated by the highest principles and moved only by Christian charity.
Source: Rerum Omnium Perturbationem (Vatican.va)