The Supper doesn’t depend on the faithfulness of the Church. It depends on the faithfulness of Christ.
A rightly-oriented heart and a rightly-oriented love will consistently do what is best for God and best for our neighbor, which is why St. Augustine speaks of sin as a disordered love.
For Bonhoeffer, Christ crucified, and the cross of the Christian life were not of peripheral importance, but foundational.

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There is a revival, no less real and even more definitive, taking place in every church, every weekend, where God’s people gather around his gifts.
To believe God is love and thus loves you is a miracle wrought by the Holy Spirit.
Jesus stands before the disciples as the bridge between heaven and earth, and between Old Testament and New Testament.
His love for you is so deep that in his mercy, while you were yet a sinner, God sent his only begotten Son to die for you.
“So loved,” then isn’t about how much but instead simply how.
Love is pointing to Jesus who said, “Greater love has no one than this, that someone lay down his life for his friends” (John 15:13).
Forty days after giving birth, Mary, along with her husband Joseph, presented their firstborn Son at the temple and "bought" him back with a sacrifice of two small birds. This is known as the "Presentation of Our Lord."
Christ our Word, as with a two-edged sword, burst the devil's belly.
Authentic proclamation, then, is the love of Christ for our souls, which we have seen and experienced through the under-shepherd’s pastoral care put into the words of Christ Himself.
The sign of the cross, according to the earliest centuries of Christians, is “the sign of the Lord,” and every baptized Christian was “marked” with it.
The sermon takes place in the context of a multi-facetted set of relationships experienced through the weeks and months of being together in congregation and community. Those relationships shape the credibility of the preacher in the pulpit. 
The usual acclamation when one becomes King is: “Long live the King!” But this King of kings, this son of David, has come to die.