It goes way back to Colosians:
“Jesus is the image of the invisible God, the first fruit of all creation. All things were created in him––the visible and invisible, thrones and lordships, rulers and all powers––in the heavens and the earth. Everything was created through him and for him. He existed before everybody and all things are sustained in him.
“He is the head of the body of the church; he is the first from the dead. He has become the one who excels all, because all the fullness was glad to dwell in him and through him in order to reconcile all things in him. Making peace through the blood of the his cross, he reconciled things on the earth and things in the heavens” 1.9-20.
And St. Bonavanture and the Franciscans developed it.
The Cosmic Christ can be defined as that aspect of God which pervades all of creation, the Christ who “fills the universe in all its parts” (Ephesians 1:23). The Franciscan teaching of this is based firmly in the theology of Bonaventure and Scotus that flows from the spirituality of Francis and Clare and their early followers. It is basically Trinity-centered and Christ-centered.
www.osfphila.org/files/file/The%20Cosmic%20Christ9-19-06.doc
It is found in the Catechism:
ccc668 “Christ died and lived again, that he might be Lord both of the dead and of the living.” Christ’s Ascension into heaven signifies his participation, in his humanity, in God’s power and authority. Jesus Christ is Lord: he possesses all power in heaven and on earth. He is “far above all rule and authority and power and dominion”, for the Father “has put all things under his feet.”
Christ is Lord of the cosmos and of history. In him human history and indeed all creation are “set forth” and transcendently fulfilled.
We are already participating in the Mystical body of Christ.
CCC788 When his visible presence was taken from them, Jesus did not leave his disciples orphans. He promised to remain with them until the end of time; he sent them his Spirit. As a result communion with Jesus has become, in a way, more intense: “By communicating his Spirit, **Christ mystically constitutes **as his body those brothers of his who are called together from every nation.”
791 The body’s unity does not do away with the diversity of its members: "In the building up of Christ’s Body there is engaged a diversity of members and functions. There is only one Spirit who, according to his own richness and the needs of the ministries, gives his different gifts for the welfare of the Church."The unity of the Mystical Body produces and stimulates charity among the faithful: “From this it follows that if one member suffers anything, all the members suffer with him, and if one member is honored, all the members together rejoice.” Finally, the unity of
the Mystical Body triumphs over all human divisions: “For as many of you as were baptized into Christ have put on Christ. There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus.”
I agree completely but mysticism is not confined to ecstasy, trancelike states or visions. It is awareness of the presence of God and our union with God.
CCC2717 Contemplative prayer is silence, the “symbol of the world to come” or “silent love.” Words in this kind of prayer are not speeches; they are like kindling that feeds the fire of love.
In this silence, unbearable to the “outer” man, the Father speaks to us his incarnate Word, who suffered, died, and rose; in this silence the Spirit of adoption enables us to share in the prayer of Jesus.
2718 Contemplative prayer is** a union with the prayer of Christ insofar as it makes us participate in his mystery**. The mystery of Christ is celebrated by the Church in the Eucharist, and the Holy Spirit makes it come alive in contemplative prayer so that our charity will manifest it in our acts.
Yes, and I think that is what Catholics involved in inter-religious dialogue have recognized. Christ is there though not fully recognized, not fully understood and perhaps even distorted and not acknowledged. Buddhists for example. There is a lot of compassion and virtue, patience and seeking and yet still no belief in a personal God.