For Fr. Franciszek Blachnicki, the catechesis was in close relationship with the Church. The most appropriate place for the catechesis as the fundamental formation of Christians (adults, youth and children) is in the Church which is both the subject, goal and object of catechesis. Fr. Franciszek Blachnicki drew the concepts of the Church from studies by German-speaking authors, and above all from documents of the Second Vatican Council. For him, the Church was an intermediary of salvation, a universal sacrament of salvation, a mother, a temple of God, and most of all, a union of God's people, a community in Christ, a community of faith, hope and love. The task of catechesis is, in the first place, the introduction and experience of the Church. The nature of catechesis stems from the concept of the Church. Therefore, if the Church is a community, the aim of catechesis is to introduce it to the faithful so that they may not only participate in it, but above all create it. It is also important that catechesis serves the process of Christian initiation, discovering the Church as a place of fulfilling the mystery of life, salvation and healing. Therefore, Fr. Blachnicki put a strong emphasis on the relationship between the liturgy and catechesis, because the most complete process of initiation takes place in the liturgy. Another task of catechesis is its function of awakening and developing faith. For faith is the foundation for the Church and the primary goal for catechesis. It is to be both personalistic and social in nature. Father Blachnicki claimed that cathechesis educated faith was not an individual faith but the faith of the Church. Many Christians, even including those most zealous, live their Christian lives alongside the life of the Church, but not in the Church. In the meantime, every Christian is the Church, because the Church is the whole Christ, the head and members, and we are its members. For that reason, the life of the Church grows in so far as the life of faith of each member grows.