One never rightly receives the Holy Eucharist without proper contrition.1 Cor 11
27 Therefore whoever eats the bread or drinks the cup of the Lord in an unworthy manner, shall be guilty of the body and the blood of the Lord. 28 But a man must examine himself, and in so doing he is to eat of the bread and drink of the cup. 29 For he who eats and drinks, eats and drinks judgment to himself if he does not judge the body rightly. 30 For this reason many among you are weak and sick, and a number
s]sleep. 31 But if we judged ourselves rightly, we would not be judged. 32 But when we are judged, we are disciplined by the Lord so that we will not be condemned along with the world.
33 So then, my brethren, when you come together to eat, wait for one another. 34 If anyone is hungry, let him eat at home, so that you will not come together for judgment.
Divine Liturgy of St. John Chrysostom
CELEBRANT AND CONCELEBRANTS: No one who is bound by carnal desires and pleasures is worthy to come to you, to approach you, or to minister to you, the King of Glory.
Later, before communion:
Holy gifts to holy people!
Liturgy of the Presanctified Gifts:The presanctified Holy Things for the holy.
After receiving the priest says Isaiah 6:7:
Behold, this has touched thy lips and will take away thy iniquities and purge away thy sins.
This reception of the Holy Gifts by the Holy people keeps them in their holiness. We later sing:
May our mouth be filled with your praise, O Lord, so that we may sing of your glory. For you have deemed us worthy to partake of your holy, divine, immortal, pure, and life-creating mysteries. Keep us in your holiness so that all the day long we may live according to your truth. Alleluia! Alleluia! Alleluia!