Brother Alexis Bugnolo is a consecrated man of private vows observing the Rule of St. Francis and is resident in Rome. He is the Editor and Publisher of The Franciscan Archive and the blog, From Rome. With Brother's permission, I have reposted this. Oh, to have the time to mine the riches of these Encyclicals past which make up the Magisterial teaching of the Church.
I imagine that if Pope Leo XIII had bloggers back then, he would have approved of blogs.
From his Encyclical Letter, Sapientiae Christianae, of January 10, 1890

15. The chief elements of this duty consist in professing openly and unflinchingly the Catholic doctrine, and in propagating it to the utmost of our power. For, as is often said, with the greatest truth, there is nothing so hurtful to Christian wisdom as that it should not be known, since it possesses, when loyally received, inherent power to drive away error. So soon as Catholic truth is apprehended by a simple and unprejudiced soul, reason yields assent. Now, faith, as a virtue, is a great boon of divine grace and goodness; nevertheless, the objects themselves to which faith is to be applied are scarcely known in any other way than through the hearing. “How shall they believe Him of whom they have not heard? and how shall they hear without a preacher? Faith then cometh by hearing, and hearing by the word of Christ.”(14) Since, then, faith is necessary for salvation, it follows that the word of Christ must tie preached. The office, indeed, of preaching, that is, of teaching, lies by divine right in the province of the pastors, namely, of the bishops whom “the Holy Spirit has placed to rule the Church of God.”(15) It belongs, above all, to the Roman Pontiff, vicar of Jesus Christ, established as head of the universal Church, teacher of all :hat pertains to morals and faith.
16. No one, however, must entertain the notion that private individuals are prevented from taking some active part in this duty of teaching, especially those on whom God has bestowed gifts of mind with the strong wish of rendering themselves useful. These, so often as circumstances demand, may take upon themselves, not, indeed, the office of the pastor, but the task of communicating to others what they have themselves received, becoming, as it were, living echoes of their masters in the faith. Such co-operation on the part of the laity has seemed to the Fathers of the Vatican Council so opportune and fruitful of good that they thought well to invite it.“All faithful Christians, but those chiefly who are in a prominent position, or engaged in teaching, we entreat, by the compassion of Jesus Christ, and enjoin by the authority of the same God and Saviour, that they bring aid to ward off and eliminate these errors from holy Church, and contribute their zealous help in spreading abroad the light of undefiled faith.”(16) Let each one, therefore, bear in mind that he both can and should, so far as may be, preach the Catholic faith by the authority of his example, and by open and constant profession of the obligations it imposes. In respect, consequently, to the duties that bind us to God and the Church, it should be borne earnestly in mind that in propagating Christian truth and warding off errors the zeal of the laity should, as far as possible, be brought actively into play.
_________________
12. Summa theologiae, IIa-IIae, qu. iii, art. 2, ad 2m.
13. John 16:33.
14. Rom. 10:14, 17.
15. Acts 20:28.
16. Constitution Dei Filius, at end.