to declare and seal

or... What is the purpose of the Lord's supper?

Answer (from my paraphrased Heidelberg Catechism): The Lord's Supper is a "...holy visible sign and seal, appointed by God for this purpose: so that he may more fully declare and seal to us the promise of the gospel, viz., that he grants us freely the remission of sin, and life eternal, for the sake of that one sacrifice of Christ, accomplished on the cross.

Question 67. Does it direct our faith to the sacrifice of Jesus Christ on the cross, as the only ground of our salvation?

Answer: You bet!: for the Holy Ghost teaches us in the gospel, and assures us by the sacraments, that the whole of our salvation depends upon that one sacrifice of Christ which he offered for us on the cross.

Question 75. How are you admonished and assured in the Lord's Supper, that you are a partaker of that one sacrifice of Christ, accomplished on the cross, and of all his benefits?

Answer: Thus: That Christ has commanded me and all believers, to eat of this broken bread, and to drink of this cup, in remembrance of him, adding these promises: first, that his body was offered and broken on the cross for me, and his blood shed for me, as certainly as I see with my eyes, the bread of the Lord broken for me, and the cup communicated to me; and further, that he feeds and nourishes my soul to everlasting life, with his crucified body and shed blood, as assuredly as I receive from the hands of the minister, and taste with my mouth the bread and cup of the Lord, as certain signs of the body and blood of Christ.

So, based on this, the next time you receive the Lord's Supper, receive it with a thankful and reverent heart. A heart that is receiving an "edible gospel sermon". The promise of the new covenant is signified and sealed to me! The cross was for me, and I, because I am united with Christ's body, consume him, by faith. He is my "manna" in the wilderness between my redemption (Exodus), and my glorification (the promised land).