God gave the Israelites manna in the desert. Without that miraculous food, they would have starved to death. It literally kept them alive. But, human nature kicked in. They grew tired of the manna and began to complain. “We want more options. We want more variety.” Manna, no matter how miraculous, was no longer good enough.
Jesus took a few fish and some loaves of bread and miraculously fed thousands of hungry people. They followed him around wanting even more. “God gave our ancestors manna in the desert. What sign can you give us? What can you do?” They had just been miraculously fed, but they wanted more. The miracle of the fish and loaves wasn’t good enough for them.
Jesus told them He would provide the true food and true drink of His flesh and blood to sustain their eternal life. They lacked understanding. Many then turned away from Him, and the betrayal of Judas took root at this point. For many of Christ’s disciples, His flesh and blood were not good enough. They wanted more. At the Last Supper, Jesus pointed out Judas as the betrayer, and showed the apostles the miracle of the Eucharist. He had told them earlier that they would need to eat His flesh and blood, and now He showed them how to do it in a miraculous manner.
Manna was not good enough for the Israelites. The miracle of the fish and the loaves was not good enough for the multitudes following Jesus around. His flesh and blood were not good enough for many of His disciples. Human nature has not changed much. His flesh and blood are still not good enough for many Christians today. They want more. More programs, more coffee, more doughnuts, more music, more excitement, more Bible studies, more interesting preaching, more miracles, etc.
What more can Jesus give than His very flesh and blood poured out and crucified for our forgiveness and salvation? What is more miraculous than the God of the universe humbling Himself in the form of bread and wine in order to spiritually and physically unite with His own, spiritual/physical creations? Add the other six sacraments and we not only have life, but life more abundantly. Why do we grumble? Don’t we have enough? We don’t even deserve what we do have. Do we really believe? God help our unbelief.