paul on communion

The Master, Jesus, on the night of his betrayal, took bread. Having given thanks, he broke it and said,

   "This is my body, broken for you.
Do this to remember me.
After supper, he did the same thing with the cup:
This cup is my blood, my new covenant with you.
Each time you drink this cup, remember me."
What you must solemnly realize is that every time you eat this bread and every time you drink this cup, you reenact in your words and actions the death of the Master. You will be drawn back to this meal again and again until the Master returns. You must never let familiarity breed contempt.
Anyone who eats the bread or drinks the cup of the Master irreverently is like part of the crowd that jeered and spit on him at his death. Is that the kind of "remembrance" you want to be part of? Examine your motives, test your heart, come to this meal in holy awe.
 If you give no thought (or worse, don't care) about the broken body of the Master when you eat and drink, you're running the risk of serious consequences.

(1 Corinthians 11:25-29 MSG)