St. John Chrysostom
John 6:60 – “But many of the disciples, when they had heard this, said, This is a hard saying.”
What means “hard?” Rough, laborious, troublesome. Yet He said nothing of this kind, for He spoke not of a mode of life, but of doctrines, continually handling the faith which is in Him. What then means, “is a hard saying?” Is it because it promises life and resurrection? Is it because He said that He came down from heaven? Or that it was impossible for one to be saved who ate not His flesh? Tell me, are these things “hard”? Who can assert that they are? What then means “hard”? It means, difficult to be received, transcending their infirmity, having much terror. For they thought that He uttered words too high for His real character, and such as were above Himself.
Source: St. John Chrysostom, Homily 47