In John's Gospel we find that after the initial stage of the supper, Christ rises, and he takes a towel and he teaches his disciples that great lesson in humility. He washes their feet.
The broken bread represents his body, broken for us, and just as the disciples did, we eat it. What does our eating symbolise? That the benefits of the suffering and death of Christ, his being punished for us to secure forgiveness for us, enter right into us symbolically. The act of eating the bread is the physical counterpart of the spiritual act of believing in Christ’s death on Calvary. The physical act has no efficacy; it is only symbolic, a remembrance of what Christ accomplished on Calvary. But by faith we are partakers of Christ. We are commanded to partake of these symbols regularly, in order to bring us back to the sole ground of our salvation – Christ’s atonement for us. When we first came to him, we trusted in him, and his poured out life entered into us. We received within us forgiveness and spiritual life. The power and blessing of his death changed us as we are born again, changed our nature, our feelings, our mind and our outlook. To believe in Christ is not merely to mentally assent to the fact that he lived, and he came to earth, and he suffered and died. It is not just a mental act. Believing means that we embrace him, we take him, and depend upon him entirely for life.
As Christ stands before his disciples and commands them to eat the tokens of his body and drink the tokens of his blood, it is his pledge that he is going to go through with Calvary and do everything necessary to procure their salvation. It shows the extent of our involvement with him and dependence on him. It demonstrates what a great cost had to be paid for us to be saved. It teaches the extent of his love.