Therefore whoever eats this bread or drinks this cup of the Lord in an unworthy manner will be guilty of the body and blood of the Lord. (I Corinthians 11:27 NIV)
Christians need to take communion seriously. True Christians are priests who have been given authority to have a relationship with Christ, and when we take communion we are performing, as it were, a priestly act. Christ is our High Priest, who gave Himself as a sacrifice for our sins so that we can have a relationship with God. When we take communion we are remembering His great sacrifice. Therefore, communion must be a thoughtful, sober, ceremony, full of respect for the Son of God, not something that is done flippantly. We have a responsibility to be thinking about Christ when we take communion. If we take it without first confessing our conscious sins, or while we are distracted about something less important, we are sinning against the body and the blood of the Lord. If you have been guilty of taking the Lord’s supper in an inappropriate spirit in the past, you need to confess this as sin before God so that He may forgive you. Make sure that you do not take it carelessly in the future.