Jesus Christ came to this earth to provide forgiveness of sin by offering Himself up on the cross as payment for our iniquity. The bread and the cup remind us of His sacrifice for us as the Lamb of God.
Yes, there is our personal need to search our hearts in preparation for taking communion, but the focus of our attention is on Jesus Christ. Through Jesus Christ alone there is final atonement for our sin. There is no more offering for sin available to man.
Communion reminds us that the gospel of Jesus Christ is truly “the power of God unto salvation for all who believe”. Through Jesus we are reconciled back to God. It’s His sacrifice that has pleased the Father. It’s His blood which provides redemption. It’s His blood that sanctifies us.
Herein is love, saints! Herein is the call to live completely for Him.