As we come to this Table in true evangelical faith, we partake of Jesus Christ. We also partake of one another, and we do this through the power and activity of the Holy Spirit of God. We are covenantally united, and the Spirit of God is the Spirit of the covenant.
Now Jesus teaches us that if we see Him we have seen the Father (John 14:9). No one comes to the Father except through Him (John 14:6), and it is not possible to have the Son without also having the Father (1 John 2:23). This means that as we partake of the Lord Jesus, we are also in some sense partaking of the Father. We are only able to do this through the work of the Holy Spirit, who is the Spirit of Christ and the Spirit of His Father also.
When Jesus offered His body and blood, which are the basis of this communion, He was submitting to the will of His Father. When He sent His disciples out to proclaim the reality of this restorative sacrifice to a wasting-away world, He specifically told them to wait until the Spirit had been poured out upon them. On the day of Pentecost, when that Spirit was poured out, they preached the Word powerfully, and afterward they broke bread together.
The Word comes in power. The bread comes in power. The wine comes in power. This is possible because the entire Godhead is involved in it. We do not manipulate Him by these means, but rather we meet Him here. We can meet Him here in faith because He promised to be here.
The persons of the Trinity can be distinguished—and must be distinguished—but they cannot be separated. If you don’t partake of them all, according to their roles, you aren’t partaking of any of them. If you come to one in reality, you have come to them all. The Father is the destination, the Lord Jesus is the road, and the Holy Spirit is the vehicle.
So come, and welcome, to Jesus Christ.