On 18th January, 1901, Pope Leo XIII issued his Encyclical Graves de Communi Re on Christian Democracy:
24. Now, in all questions of this sort where the interests of the Church and the Christian people are so closely allied, it is evident what they who are in the sacred ministry should do, and it is clear how industrious they should be in inculcating right doctrine and in teaching the duties of prudence and charity. To go out and move among the people, to exert a healthy influence on them by adapting themselves to the present condition of things, is what more than once in addressing the clergy We have advised. More frequently, also, in writing to the bishops and other dignitaries of the Church, and especially of late,[15] We have lauded this affectionate solicitude for the people and declared it to be the special duty of both the secular and regular clergy. But in the fulfillment of this obligation let there be the greatest caution and prudence exerted, and let it be done after the fashion of the saints. Francis, who was poor and humble, Vincent of Paul, the father of the afflicted classes, and very many others whom the Church keeps ever in her memory were wont to lavish their care upon the people, but in such wise as not to be engrossed overmuch or to be unmindful of themselves or to let it prevent them from laboring with the same assiduity in the perfection of their own soul and the cultivation of virtue.
