There are many aspects to this Supper, but one of them is that it is an expression of loyalty. In this meal, the Lord offers Himself to all who come to Him in faith, and all who come to Him in faith offer themselves in return, in a devout imitation.
Christ offers Himself. We may describe this doctrinally, but He does not offer us a mere doctrine. We may enact this liturgically, but He does not offer a liturgical shell. God offers us Himself. He gives Himself, and in the power of the Spirit, He gives Himself wholly.
We are to act as dearly beloved children, which means that we are to imitate Him in this. We come here to express our all-in loyalty. There are to be no double loyalties here—nothing else can be permitted to compete with the place of Christ in our hearts.
We do this fully aware of all the distractions that pull at our sleeves on a daily basis. We know of our faults and failings, and our propensity to wander. But that does not exclude us from this meal—God knows what kind of world we live in, and He knows what kinds of temptations we face. What we are dealing with is “common to man,” and God has provided us with Word and sacrament. But note that these are merely instruments by which He provides us with Himself.
If you would profit by this—and why would you not want to profit by it—then you must receive what is actually being offered. When you do this, your loyalties are aligned with His, and His Spirit equips you fully.
So come, and welcome, to Jesus Christ.