176 In keeping with your pastoral solicitude, Venerable Brethren, do not cease to recommend and encourage these exercises of piety from which the faithful, entrusted to your care, cannot but derive salutary fruit. Above all, do not allow - as some do, who are deceived under the pretext of restoring the liturgy or who idly claim that only liturgical rites are of any real value and dignity - that churches be closed during the hours not appointed for public functions, as has already happened in some places: where the adoration of the august sacrament and visits to our Lord in the tabernacles are neglected; where confession of devotion is discouraged; and devotion to the Virgin Mother of God, a sign of "predestination" according to the opinion of holy men, is so neglected, especially among the young, as to fade away and gradually vanish. Such conduct most harmful to Christian piety is like poisonous fruit, growing on the infected branches of a healthy tree, which must be cut off so that the life-giving sap of the tree may bring forth only the best fruit.
Source: Mediator Dei (Vatican.va)