The word mystery has had born inside of greek cultual ambience and it has been introduced by the translators in the Holy Scriptures translations from Old Testament in order to translate the words râz and sôd, respectively, in Aramaic and Hebrew idioms, receiving their semantic charge according to First Alliance People faith. Posteriorly, the New Testament, especially the Pauline letters, used widely the word mystery. In the progressive development inside of the Scripture Text, the concept of mystery means the revelation of the God Father salvation plan by Jesus Christ through successive and concatenated stages. The patristic theology, receiving the concept of mystery from biblical tradition, continued developing it as its interdependent mediations in the ecclesial stage: the History of Salvation, the Church, the Word of God and the Liturgy. In the first half of the century XX, because of the distance from theology to biblical and patristic sources, the benedictine monk Odo Casel reintroduced the concept the mystery in the theological and liturgical reflections, recovering its source strength. This recovering, in spite of critical positions, little by little, was incorporated by ecclesial works. In this incorporation, the Constitution on the Sacred Liturgy is the primary and paradigmatic work at reintroducing of the theology of the mystery by the Church. Indeed, council Fathers mysterical insights, written in the Sacrosanctum Concilium, developed on the others Constitution from the Vatican Council II, providing the current church a rich heritage in order to criticize its theological and pastoral practices.