The term symbol has been used more than once in this discussion, so let me offer this:
In metaphysical circles it is generally understood, and in esoteric circles it is insisted upon, that a symbol is not merely a representation, nor just a metaphor, an analogy, or a sign.
The easiest way to approach what is a huge and often overlooked subject is in the latter: A sign points to where something might be found, whereas the symbol possesses the essence of the thing to which it directs, in itself. A symbol is a sign, in that it points to a reality, but at the same time that reality is present, in essence, in the symbol, which it is not in the sign.
Carl Jung, for example, defined the symbol as other than a sign because the object of a sign is known, whereas the object of a symbol is a mystery — something that can be intimated but cannot be stated empirically or definitively.
So my whole point is that Jesus speaks in symbolic language and symbolic actions, investing his words and His actions with the essence of His own, divine, being. Hence the reserve for the Divine Name from Antiquity, because it was believed that to utter the name was to invoke the named.
In breaking bread with his disciples, He instituted a Mystical Rite of initiation, in that the transubstantiation of the bread and wine into the body and blood means that when we, in turn, receive of that meal, a transubstantiation can take place in the soul, which is vivified and fortified by the receipt of the Divine Substance mysteriously present in the Eucharistic species of bread and wine ... that is why the bread and the wine remain, to all outward appearances, bread and wine ... but they have been substantially changed, as we are substantially changed by the infusion of the Holy Spirit according to the Sacrament Our Lord established for our spiritual sustenance and advancement.
There ... that's enough to trigger a number of rebukes and rebuttals but, please save your effort, as I have already gone further than I had intended, and will discuss this point no further.
Thomas