In theological discussions of the sacrament, the distinction between sign and thing signified goes back to the great Augustine. This is a distinction that is essential for us to maintain if we are to keep ourselves out of superstition and idolatry. At the same time, we must make this distinction without dividing or separating the sign and thing signified. If we break the sign and thing signified in two, the only thing we will find ourselves holding is the mangled sign, with the reality long gone. They cannot be there together, except as God has appointed.
The appointed instrument that God has given that enables us to hold sign and thing signified together is faith—the kind of faith given by Him, which means that it necessarily is vibrant, alive, receptive, eager or, to use the word that sums it all up, evangelical.
Simple faith can see at a glance things which unconverted philosophers and theologians with bulging foreheads cannot figure out. Faith does not create mysteries on a table, trying to figure out what is going on inside the bread or inside the wine. Faith receives the mystery into the body of Christ—you are that body—and there sees what God intends when He speaks of greater things under the form of the lesser.
What is offered here, in words and actions, is the body of Jesus, the blood of Jesus. But what is actually being offered is totus Christus, all of Christ, the entire Jesus. This is all about union with Christ, and remember that union with Christ is only effectual when received by faith, and it is not possible for a true faith to receive a partial Christ.
In a similar way, these emblems, these elements, are received by you with your hands and your mouth. But your hands and your mouth also represent something. They are also a lesser thing that represents, necessarily, much more. They represent all of you—body, soul, and spirit—and they represent you resting in Christ forever and ever, world without end.
So true faith receives the true and entire Christ into the true and new humanity, being grown up into the perfect man. So come, and welcome, to Jesus Christ.