In the Lord’s Supper, we are joined to Christ by the work of the Holy Spirit. Hence our union with Christ is impossible apart from the work of the Spirit. As declared by the Apostle John, what is born of the flesh is flesh, and must remain flesh, unless the Holy Spirit Himself makes it spiritual (cf. John 3:5). Therefore, we must be born again to enjoy the benefits of our union with Christ. Our souls cannot be united with Christ, nor can His body be joined to our souls, except by a spiritual bond. Christ is united with us by a spiritual bond, that is, by the power of the Holy Spirit. By His Spirit, all we who are faithful are baptized into one Body (cf. 1 Corinthians 12:13). Consider the words of Robert Bruce:
This secret conjunction, then, is brought about by faith and by the Holy Spirit. By faith we lay hold upon the Body and Blood of Christ, and though we are as far distant as heaven and earth are, the Spirit serves as a ladder to unite us with Christ, like the ladder of Jacob, which reached from the ground to the heavens. So the Spirit of God unites the Body of Christ with my soul. Hughes Oliphant Old, Holy Communion in the Piety of the Reformed Church, p. 276
Truly Christ is present at the Supper through the working of His Holy Spirit. It is the Holy Spirit working in our hearts for our redemption and for our sanctification that unites us to Christ. Through the work of the Holy Spirit, the presence of Christ is a transforming presence. The Spirit fashions our hearts into conformity with Christ and renews in us the image of God. It is through this transforming presence of the Holy Spirit, Christ’s presence is manifested.
The Holy Spirit is the spirit of liberty and the spirit of prayer. The Spirit frees us from fear that we have by nature and the fear that makes us run from God when He calls us to Himself. The Holy Spirit is the witness who leads us into all truth (cf. John 14:17). It is the Holy Spirit who convinces us of the truth of God’s Word. Moreover, the Spirit of God is the seal ratifying to us the covenantal promises.
Everything depends, then, upon the operation of the Holy Spirit; the whole regeneration of mankind, the renewing of the heart and of the conscience, depend on the power of the Holy Spirit. Therefore, it behooves us to carefully employ our labors in calling upon God for His Holy Spirit. It is by this means and no other that the Holy Spirit creates faith in us, and nourishes and augments what He has already begotten. For this reason, this minister prays for the Holy Spirit to reside among us during the Supper and we should pray that the Holy Spirit opens the eyes of our heart to receive Christ at the Table.
The sacrament of Holy Communion in the end is a work of the Holy Spirit in our hearts. We should approach the sacrament in a spirit of meditation and prayer. We should participate in the sacrament of Holy Communion meditating on what we are doing and what God is doing for us in this sacrament so that when we depart from the worshiping assembly, we can dedicate ourselves to the service of God and the fellowship and support of our neighbor.