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.
In the early Church, the catechumenate and preparation for the sacraments of Baptism and the Eucharist were the same thing. Although in the countries that have long been Christian the Church has changed her practice in this field, the catechumenate has never been abolished; on the contrary, it is experiencing a renewal in those countries1 and is abundantly practiced in the young missionary Churches. In any case, catechesis always has reference to the sacraments. On the one hand, the catechesis that prepares for the sacraments is an eminent kind, and every form of catechesis necessarily leads to the sacraments of faith. On the other hand, authentic practice of the sacraments is bound to have a catechetical aspect. In other words, 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.
Cf. Ordo Initiationis Christianae Adultorum.