24 Amidst all the aberrations of human thought, infatuated by a false emancipation from every law and curb; and amidst the awful corruptions of human malice, the Church rises up like a bright lighthouse warning by the clearness of its beam every deviation to right or left from the way of truth, and pointing out to one and all the right course that they should follow. Woe if ever this beacon should be - We do not say extinguished, for that is impossible owing to the unfailing promises on which it is founded - but if it should be hindered from shedding far and wide its beneficent light! We see already with Our own eyes whither the world has been brought by its arrogant rejection of divine revelation, and its pursuit of false philosophical and moral theories that bear the specious name of "science." That it has not fallen still lower down the slope of error and vice is due to the guidance of the light of Christian truth that always shines in the world. Now the Church exercises her "ministry of the word" through her priests of every grade of the Hierarchy, in which each has his wisely allotted place. These she sends everywhere as unwearied heralds of the good tidings which alone can save and advance true civilization and culture, or help them to rise again. The word of the priest enters the soul and brings light and power; the voice of the priest rises calmly above the storms of passion, fearlessly to proclaim the truth, and exhort to the good; that truth which elucidates and solves the gravest problems of human life; that good which no misfortune can take from us, which death but secures and renders immortal.
Source: Ad Catholici Sacerdotii (Vatican.va)