202 By means of suitable sermons and particularly by periodic conferences and lectures, by special study weeks and the like, teach the Christian people carefully about the treasures of piety contained in the sacred liturgy so that they may be able to profit more abundantly by these supernatural gifts. In this matter, those who are active in the ranks of Catholic Action will certainly be a help to you, since they are ever at the service of the hierarchy in the work of promoting the kingdom of Jesus Christ.
Source: Mediator Dei (Vatican.va)