The thesis deals with the theme of secrets as itself and how it is related to the church. Its main issue if is it a church that creates mystery, or whether the mystery is creates church. Furthermore, the work seeks to examine the veracity of statements II. Vatican concilium, which identify the Church as sacrament, that mean the secret. The work examines the main approaches to the mystery and the language they speak about him. While access to the mystery, which has Gnostic character and is well characterized and defined conceptually, it can be seen that the designation anit-gnostic mystery of missing a simple term. Work and offers use of the term exotheric, which is contrary to esoteric and further work highlights the typical character and timbre of this exotheric mystery. The work also aligns with the mystery as objective scientific phenomenon and examines whether the other sciences (mathematics or astronomy) may be encountered exoteric and objective mystery. Investigate the findings are eventually applied to the discourse on the Church, which shows that if the church was not defined as secret, it would be reduced to mere human community and vice versa, if the Church was reduced only as a community insider secrets, it would be just another gnostic sect.