1 Corinthians 11:28 Let a person examine himself, and so eat of the bread and drink of the cup.

Do you keep an extra house key hidden underneath a rock, plater, or garden gnome in the front yard? Your home is secure only until someone overturns the stone. Some stones were not meant to be overturned. Some doors were not meant to be opened - at least, not yet. Many of the greatest errors in Christian teaching have been a result of manufacturing answers when God is silent. How can bread and wine also be the very body and blood of our Savior, Jesus Chrust? No one on earth understands how, and only through faith do we believe it. Much Christian frustration has its roots in looking for evidence in the wrong places. As Luther explains, we imagine that a full accounting of sin is sufficient evidence of preparedness for Holy Communion. 

Why should we be surprised to find that we doubt Holy Communion? Without the work of the Holy Spirit, we would not trust in Christ! Therefore, be comforted. Our Heavenly Father knows that we struggle and doubt. Doubt in Holy Communion need not suggest that it is false, but rather that saints are still sinners. Cry out to the Lord, "Help my unbelief!" He will do so. He will cast away doubt and fortify the faith He created. He will do so because He wants you to have the benefits of His work on the cross - forgiveness of sins and life eternal.
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