Liturgical theology has been interested in bringing together the concepts of mystery, mystagogy and mysticism. Our research wants to contribute to advance current debates. Therefore, we researched the notion of mystery according to the theology developed in the second, fifth and sixth articles of the Constitution on the sacred liturgy of the Second Vatican Council. Conciliar theology understands mystery as the salvation of the Father, accomplished by the Son, communicated by the Holy Spirit, through the church in its double mission: proclamation and celebration. Then we present the work of retrieving and updating the mystagogical experience over the last few years. The current mystagogy is approached in catechetical (mystagogical catechesis and christian initiation), liturgical (liturgical theology) and spiritual (liturgical mystic) view. Finally, we relate the understanding of the phenomenon of Christian mysticism in line with the theological-pastoral notions of the concept of mystery and mystagogy. Christian liturgical mysticism is one in which the initiates experience in their lives the communicative-therapeutic force of Christ s paschal mystery. The conclusion is that the mystery-mystagogymystical trinomial, because they are inseparable, needs to penetrate and be consolidated in ecclesial theology and praxis.