Eating and drinking the Lord’s Supper is for the children of God, in order to strengthen their faith which is a work of the Spirit of God, that we may overcome the world.
The victory that victories the world is our faith (1 John 5:4), and in particular our faith that Jesus is the Son of God (1 John 5:5). The Spirit is the one who testifies that this is true, and the testimony of God is greater than the testimony of man (1 John 5:6, 9).
To the world it is a ridiculous thing to eat bread as though it were Jesus’ body and to drink wine as though it were Jesus’ blood. Some even call it scandalous. It’s gross. It’s superstitious. And it certainly can’t be more than a strategic dud. For those who don’t have the testimony, it is a dud. “What good is that?”
But all they have are idols. They are still under the power of the evil one. They do not have understanding. They do not know Him who is true. They do not have eternal life. They are outside of God’s love. They are in a system, the world, destined to lose.
By faith we hold fast to God’s Son, Jesus Christ, who is the true God and eternal life. The Spirit testifies in our faith that we are God’s children, His heirs, and co-heirs with Christ. We come to this family Table as those who have been born of God, and “everyone who has been born of God overcomes the world (1 John 5:4).