The Cup,the church,contains the life in Christ.
The content of this life is Christ's blood
The blood of Christ is life, forgiveness and the Gospel to be preached,
So this verse says all to be said about the Christian life.
This is a tough verse. I was at a firearms training and a fellow student cited this verse as Jesus stating it is OK to carry a concealed weapon. I disagreed with him. A short sword of the time was not a concealable weapon. And I don't believe that was what Jesus was saying at all.
The content of this life is Christ's blood
The blood of Christ is life, forgiveness and the Gospel to be preached,
So this verse says all to be said about the Christian life.