St. John 6 contemplates three miracles, of which the third is the greatest. The multitudes in the wilderness following Jesus call to mind the multitudes that followed Moses and were fed manna from heaven. This is the first miracle, a daily event for the Israelites. The second is greater, for here it is a Man who provides bread in the wilderness to 5,000, a multiplication of loaves. It shows this Man to be God.
The third is the greatest, toward which he wishes to prepare the hearts of his disciples when he says, "I am the Bread of Life." For this is not some mere figurative language, else why would the Jews be scandalized by it? "My flesh is bread indeed, and my blood is drink indeed." In this we are brought to see that the Blessed Sacrament is the greatest of miracles, for here is Christ, the Bread from heaven, given to us as bread to eat, in order to unite us with his divinity.