Jesus therefore said to them, "Most assuredly, I tell you, it wasn't Moses who gave you the bread out of heaven, but my Father gives you the true bread out of heaven.
In many of God's wonders, there are primary and secondary manifestations of them, as in the rainbow, the primary bow always appearing brighter and on the lower level, and with the colors reversed in the secondary.  Thus, there are two miracles in view in sign four.  The primary wonder was the barley loaves, the higher marvel being Christ himself, the true bread of heaven.  In this remarkable analogy, a change of status appears in the function of Christ, who in the physical miracle was the provider, but who in the spiritual counterpart of it appeared as the bread provided, recalling the reversal of the rainbow colors mentioned above.  Jesus never succeeded in lifting the eyes of his audience to that higher level of seeing the true bread of life.  The barley loaves, the barley loaves, the barley loaves!