I know the following is a reminder, but the Lord’s Table is a supper of remembrance, so it fits.
The communion we have is in Christ. That prepositional phrase was one of the apostle Paul’s favorites. Our faith is “in Christ” (Acts 24:24; Galatians 2:16), meaning that we trust Him, but there is more to it.
Our redemption is in Christ (Romans 3:24), our eternal life is in Christ (Romans 6:23). There is no condemnation for those in Christ (Romans 8:1), so we are free from sin and death in Christ (Romans 8:2). We are sanctified in Christ (1 Corinthians 1:2), we are established by God in Christ (2 Corinthians 1:21). We are sons of God in Christ (Galatians 3:26), all one in Christ (Galatians 3:28), and blessed in Christ with every spiritual blessing in the heavenly places (Ephesians 1:3).
“So we, though many, are one body in Christ” (Romans 12:5).
Jesus Christ himself can be established as the binding agent of the fellowship of the church. He in fact must be the lively center of the whole organism of the church; he is like the hub of the wheel, by whose rotations and circular motions the entire effort of the church receives its impulse and is moved. He is that splendid sun, whose shining radiance glitteringly illuminates the whole church body, by whose glowing heat the heart of the whole church is warmed and inflamed.”—Abraham Kuyper, On the Church, 23
He is the Great Shepherd who laid down His life for His flock, He is the Vine who holds and who gives strength to all the branches. The cup and the bread a participation in the body and blood of Christ (1 Corinthians 10:16). All this is God’s grace to us in Christ.