What is private revelation?

There are two kinds of revelations:

(1)  universal revelations, which are contained in the Bible or in the depositum of Apostolic tradition transmitted by the Church. These ended with the preaching of the Apostles and must be believed by all;

(2)  particular or private revelations which are constantly occurring among Christians. When the Church approves private revelations, she declares only that there is nothing in them contrary faith or good morals, and that they may be read without danger or even with profit; no obligation is thereby imposed on the faithful to believe them. Speaking of such revelations as (e.g.) those of St. Hildegard (approved in part by Eugenius III), St. Bridget (by Boniface IX), and St. Catherine of Siena (by Gregory XI) Benedict XIV says: “It is not obligatory nor even possible to give them the assent of Catholic faith, but only of human faith, in conformity with the dictates of prudence, which presents them to us as probable and worthy of pius belief)” (De canon., III, liii, xxii, II).

“The Christian economy, therefore, since it is the new and definitive Covenant, will never pass away; and no new public revelation is to be expected before the glorious manifestation of our Lord Jesus Christ.” Yet even if Revelation is already complete, it has not been made completely explicit; it remains for Christian faith gradually to grasp its full significance over the course of the centuries.

Throughout the ages, there have been so-called “private” revelations, some of which have been recognized by the authority of the Church. They do not belong, however, to the deposit of faith. It is not their role to improve or complete Christ’s definitive Revelation, but to help live more fully by it in a certain period of history. Guided by the Magisterium of the Church, the sensus fidelium knows how to discern and welcome in these revelations whatever constitutes an authentic call of Christ or his saints to the Church.” (CCC, 66,67)