John 6:61

When you hear, however, of His disciples murmuring, understand not those really such, but rather some who, as far as their air and behaviour went, seemed to be receiving instruction from Him. For among His disciples were some of the people, who were called such, because they stayed some time with His disciples.

When Jesus knew in himself,....

Jesus knew in himself - By giving them this proof that he knew their hearts he also proved that he was God; that he could not be deceived himself, and that it was impossible for him to deceive any; consequently, that the doctrine he taught them must be the truth of God.

We learn from these verses that some of Christ's sayings seem hard to flesh and blood. We are told that "many" who had followed our Lord for a season, were offended when He spoke of "eating his flesh and drinking his blood." They murmured and said, "This is an hard saying; who can accept it?" Murmurs and complaints of this kind are very common. It must never surprise us to hear them. They have been, they are, they will be as long as the world stands. To some Christ's sayings appear hard to understand.

We learn from these verses that some of Christ's sayings seem hard to flesh and blood. We are told that "many" who had followed our Lord for a season, were offended when He spoke of "eating his flesh and drinking his blood." They murmured and said, "This is an hard saying; who can accept it?" Murmurs and complaints of this kind are very common. It must never surprise us to hear them. They have been, they are, they will be as long as the world stands. To some Christ's sayings appear hard to understand. To others, as in the present case, they appear hard to believe, and harder still to obey. It is just one of the many ways in which the natural corruption of man shows itself. So long as the heart is naturally proud, worldly, unbelieving, and fond of self-indulgence, if not of sin, so long there will never be lacking people who will say of Christian doctrines and precepts, "These are hard sayings; who can hear them?" Humility is the frame of mind which we should labor and pray for, if we would not be offended by scriptural teaching. If we find any of Christ's sayings hard to understand, we should humbly remember our present ignorance, and believe that we shall know more by and bye. If we find any of His sayings difficult to obey, we should humbly recollect that He will never require of us impossibilities, and that what He bids us do, He will give us grace to perform. We learn, secondly, from these verses, that we must beware of putting a carnal meaning on spiritual words. We read that our Lord said to the murmuring Jews who stumbled at the idea of eating His flesh and drinking His blood, "It is the Spirit who gives life; the flesh profits nothing—the words that I speak unto you, they are spirit and they are life." It is useless to deny that this verse is full of difficulties. It contains expressions "hard to be understood."