6. The lay apostolate is unquestionably “secular”. It requires that the laity “seek the kingdom of God by engaging in temporal affairs and directing them according to God’s will” (cf. SECOND VATICAN ECUMENICAL COUNCIL Dogmatic Constitution on the Church Lumen Gentium, 31). In their daily life, interwoven with family and social relationships, the laity come to realize that they “are given this special vocation: to make the Church present and fruitful in those places and circumstances where it is only through them that she can become the salt of the earth” (ibid., 33). We do well to remember, however, that in addition to this apostolate, “the laity can be called in different ways to more immediate cooperation in the apostolate of the hierarchy, like those men and women who helped the apostle Paul in the Gospel, working hard in the Lord” (ibid.).
The role played by catechists is one specific form of service among others within the Christian community. Catechists are called first to be expert in the pastoral service of transmitting the faith as it develops through its different stages from the initial proclamation of the kerygma to the instruction that presents our new life in Christ and prepares for the sacraments of Christian initiation, and then to the ongoing formation that can allow each person to give an accounting of the hope within them (cf. 1 Pet 3:15). At the same time, every catechist must be a witness to the faith, a teacher and mystagogue, a companion and pedagogue, who teaches for the Church. Only through prayer, study, and direct participation in the life of the community can they grow in this identity and the integrity and responsibility that it entails (cf. Pontifical Council for the Promotion of the New Evangelization, Directory for Catechesis, 113).
Pope Francis, Antiquum Ministerium (Vatican.va)