Pope Saint John Paul II, excerpt from Apostolic Exhortation Catechesi Tradendae (1979):

Catechesis is intrinsically linked with the whole of liturgical and sacramental activity, for it is in the sacraments, especially in the Eucharist, that Christ Jesus works in fullness for the transformation of human beings.”

“…sacramental life is impoverished and very soon turns into hollow ritualism if it is not based on serious knowledge of the meaning of the sacraments, and catechesis becomes intellectualized if it fails to come alive in the sacramental practice.”

“The more the Church, whether on the local or the universal level, gives catechesis priority over other works and undertakings the results of which would be more spectacular, the more she finds in catechesis a strengthening of her internal life as a community of believers and of her external activity as a missionary Church.”