1 Corinthians 11:23-26 ESV (23) For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread, (24) and when he had given thanks, he broke it, and said, "This is my body which is for you. Do this in remembrance of me." (25) In the same way also he took the cup, after supper, saying, "This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me." (26) For as often as you eat this bread and drink the cup, you proclaim the Lord's death until he comes.
Our Christian bookstores are filled with "self-help" books trying to fix the old Adamic nature. Somehow the church has gotten the idea that we can have our sins "dealt with" without the shed blood of our Lord and we just need to be a more moral people. God did not send our Lord to repair old Adam, but to replace him. God did not send our Lord to make man moral but to make man righteous.
We as the body of Christ have somehow adopted a teaching that our sins are pardoned, forgiven, and delivered by an activity in which we control by the way we think, feel, or choose.
We have remission of our sins only through the blood of our Lord Jesus Christ. Any thought that we have anything to bring to the table for our salvation is birthed out of the doctrine of "humanism" and robs from the grace of God. It is ALL ABOUT HIM, and not about us.
We are free from sin, (no longer a slave to sin) because of the work of the cross in the shedding of the blood of the Lamb of God. The church body has been given an ordinance that pictures the work of the cross. We mentally and emotionally acknowledge the work of the cross and salvation by grace by taking the Lord's Supper (Communion).
Matthew 26:26-30 ESV Now as they were eating, Jesus took bread, and after blessing it broke it and gave it to the disciples, and said, "Take, eat; this is my body." (27) And he took a cup, and when he had given thanks he gave it to them, saying, "Drink of it, all of you, (28) for this is my blood of the covenant, which is poured out for many for the forgiveness of sins. (29) I tell you I will not drink again of this fruit of the vine until that day when I drink it new with you in my Father's kingdom." (30) And when they had sung a hymn, they went out to the Mount of Olives.