Catechesis acquires certain characteristics in virtue of being an "essential moment" in the process of evangelization, in the service of Christian initiation. 202Cf. CT 21. It is: – a comprehensive and systematic formation in the faith. The Synod of 1977 underscored the need for a "comprehensive and structured" 203Two things need to be underlined in this synodal contribution taken from Catechesi Tradendae: the preoccupation to take into account a pastoral problem ("I insist on the necessity of an organic and systematic Christian education because for diverse reasons there has been a tendency to minimize its importance"), and the fact of considering the organic nature of catechesis as the principal characteristic connoting it. catechesis, since catechesis is principally distinguished from other forms of presenting the word of God by its comprehensive and vital deepening of the mystery of Christ; – this comprehensive formation includes more than instruction: it is an apprenticeship of the entire Christian life, it is a "complete Christian initiation", 204CT 21. which promotes an authentic following of Christ, focused on his Person; it implies education in knowledge of the faith and in the life of faith, in such a manner that the entire person, at his deepest levels, feels enriched by the word of God; it helps the disciple of Christ to transform the old man in order to assume his baptismal responsibilities and to profess the faith from the "heart"; 205Cf. CT 20; St Augustine, De catechizandis rudibus, I, chap. 4, n. 8; CCL 46, 128-129. – a basic and essential formation, 206Cf. CT 21b. centred on what constitutes the nucleus of Christian experience, the most fundamental certainties of the faith and the most essential evangelical values; it lays the foundation of the spiritual edifice of the Christian, nurtures the roots of his faith life and enables him to receive more solid nourishment in the ordinary life of the Christian community.
In summary, initiatory catechesis, being comprehensive and systematic, cannot be reduced to the circumstantial or the occasional. 207Cf. CT 21c. As it is formation for the Christian life it comprises but surpasses mere instruction. 208Cf. CT 33 and CCC 1231; AG 14. Being essential, it looks to what is "common" for the Christian, without entering into disputed questions nor transforming itself into a form of theological investigation. Finally, being initiatory, it incorporates into the community, which lives, celebrates and bears witness to the faith. It fulfils, at once, initiatory, educational and instructional functions. 209Cf. DCG (1971) 31. This inherent richness in the Catechumenate of non-baptized adults should serve to inspire other forms of catechesis.