What is Holy Communion? Is it just a symbol?

The Orthodox nuance

In several Protestant traditions, the Supper is understood mainly as a memorial. This intention seeks to keep the memory of Christ's Passion alive, and it deserves to be heard with respect. But the ancient Church confessed more: when Christ says in John 6 that His flesh is true food, the Church recognizes the real gift of His Body and Blood.

Still, we must speak of this mystery with measure. In the Latin West, the word "transubstantiation" has been used to say that the change of the gifts is real. Orthodoxy also confesses this real change, but without enclosing the mystery in a philosophical explanation of the "how." It is not a mechanism to take apart; it is a Sacrament, the work of the Holy Spirit invoked over the gifts at the Liturgy.

And that is why you do not receive Communion in a rush. You prepare yourself through confession, fasting according to your situation, reconciliation, and prayer, because Saint Paul warns that whoever partakes unworthily harms himself (1 Corinthians 11:27-29). Not out of servile fear, but out of reverence before Christ who gives Himself.