"...Private revelations often spring from popular piety...This does not exclude that they will have an effect even on the liturgy, as we see...in the feasts of Corpus Christi and of the Sacred Heart. From one point of view, the relationship between Revelation and private revelations appears in the relationship between the liturgy and popular piety: The liturgy is the criterion, it is the living form of the Church...fed directly by the Gospel. Popular piety is a sign that the faith is spreading its roots into the heart of a people in such a way that it reaches into daily life. Popular religiosity is the first and fundamental mode of 'inculturation' of the faith. While it must always take its lead and direction from the liturgy, it enriches the faith by involving the heart."