Day 104: The Holy Spirit and the Church

The mission of Christ and the Holy Spirit is brought to completion in the Church, which is the Body of Christ and the Temple of the Holy Spirit. This joint mission henceforth brings Christ's faithful to share in his communion with the Father in the Holy Spirit. the Spirit prepares men and goes out to them with his grace, in order to draw them to Christ. the Spirit manifests the risen Lord to them, recalls his word to them, and opens their minds to the understanding of his Death and Resurrection. He makes present the mystery of Christ, supremely in the Eucharist, in order to reconcile them, to bring them into communion with God, so that they may "bear much fruit." CCC 737

In today's reading, the Catechism speaks of the mission of the Holy Spirit and of Christ that "is brought to completion in the Church." As faithful Catholics, we are called to be His witnesses, to respond to the Spirit, and to spread the Gospel. A beautiful way the Catechism states this is we are to "spread the mystery of the communion of the Holy Trinity" (a bit of theosis perhaps in action?). The Catechism Compendium sums this up:

Christ communicates his Spirit and the grace of God through the sacraments to all the members of the Church, who thus bear the fruits of the new life of the Spirit. The Holy Spirit is also the Master of prayer. (#146)

I also rather like how the Catechism Companion, Vol I elaborates on this:

The mission of Christ and work of the Holy Spirit is made effective in the life of the Church... [which] communicates God's grace. The Holy Spirit continues to be the one who reveals Jesus to us. The Church is meant to teach and live the truth and to bring new life to others and bring others to this new life... Jesus did not just teach. Above all, he gave us access to the Father. Since that was his mission, it is our mission too. (p. 212)