John Calvin Commentary John 6:59

"These things said he in the synagogue, as he taught in Capernaum." — John 6:59 (ASV)

He spoke these things in the synagogue. John points out the place, so that we may know that many were present, and likewise, that a sermon was delivered on a weighty and important subject. But it immediately follows that from such a great multitude, very few could be found who profited from it; and — what is worse — it proved to be the occasion of desertion for many who professed to be disciples of Christ.

If the Evangelist had said that only some of them were offended, that should have been considered monstrous; but when they rise up in crowds and conspire together against him, what name should we give to such an action? Let this narrative, then, be deeply impressed on our minds, so that we may never murmur against Christ when he speaks; and if today we perceive anything of this kind in others, let not their pride disturb our faith.