Unbelief is basically a spiritual issue, not an intellectual issue. All the while, as we wrestle with these passages, and seek to live out their truths as best we can, God is conforming our character to be holy and righteous, as God is.
Gospel of John: Manna from Heaven
It was a new aspect of the bread that would not perish. Not only would the bread itself last into eternity, but all who ate of it would also last into eternity.