We are to live our lives surrendered unto Christ and separated from the sins and immorality of this world, for we are in this world but not of this world. Man looks on the outward appearance , but God sees the true motives and intent of the heart. So we must make sure our hearts are free from sin, things like unforgiveness , bitterness, hatred, etc. Before partaking of the Lord's Supper, we are to examine our hearts, repent of any sins, and prepare our hearts through praise and adoration to our King. We need to rely on the Holy Spirit to help us to live the Christian life day by day, serving with with a pure heart, and a heart filled with gratitude and love for Him.