Since Jesus is God and the Father, Son and Holy Spirit are one, when you receive the Eucharist, are you receiving all persons of the Trinity, or just God, the Son?
No you are receiving ‘just’ Jesus. However, because of how the three distinct persons of the Trinity cannot be separated because of their relationship when you receive the Eucharist you are coming into communion with the Trinity.
At Mass we worship the Father through the sacrifice of the Son thanks to the power of the Holy Spirit. You cannot break this relationship.
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