Orthodox Catechism Question 79

Question 79:
How does the Lord's Supper remind you and assure you that you
share in Christ's one sacrifice on the cross and in all his gifts?
Answer:
In this way: Christ has commanded me and all believers to eat
this broken bread and to drink this cup. With this command he
gave this promise:1 First, as surely as I see with my eyes the
bread of the Lord broken for me and the cup given to me, so
surely his body was offered and broken for me and his blood
poured out for me on the cross. Second, as surely as I receive
from the hand of the one who serves, and taste with my mouth
the bread and cup of the Lord, given me as sure signs of Christ's
body and blood, so surely he nourishes and refreshes my soul for
eternal life with his crucified body and poured-out blood. (a)
(a) Matt. 26:26-28; Mark 14:22-24; Luke 22:19-20;
1 Cor. 11:23-2