16 We approach the subject with confidence, and in the exercise of the rights which manifestly appertain to Us, for no practical solution of this question will be found apart from the intervention of religion and of the Church. It is We who are the chief guardian of religion and the chief dispenser of what pertains to the Church; and by keeping silence we would seem to neglect the duty incumbent on us. Doubtless, this most serious question demands the attention and the efforts of others besides ourselves - to wit, of the rulers of States, of employers of labor, of the wealthy, aye, of the working classes themselves, for whom We are pleading. But We affirm without hesitation that all the striving of men will be vain if they leave out the Church. It is the Church that insists, on the authority of the Gospel, upon those teachings whereby the conflict can be brought to an end, or rendered, at least, far less bitter; the Church uses her efforts not only to enlighten the mind, but to direct by her precepts the life and conduct of each and all; the Church improves and betters the condition of the working man by means of numerous organizations; does her best to enlist the services of all classes in discussing and endeavoring to further in the most practical way, the interests of the working classes; and considers that for this purpose recourse should be had, in due measure and degree, to the intervention of the law and of State authority.
Source: Rerum Novarum (Vatican.va)