John 6:60 Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it? 61 When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you?
In applying the above verse to ourselves, two things should be noted. First, that when today professing Christians criticize a servant of God who is really giving out Divine truth, and complain that his teaching is “An hard saying,” it is always to be traced back to the same cause as operated here. Many disciples will still reject the Word of God when it is ministered in the power of the Spirit, and they will do so because it conflicts with their own views and contravenes the traditions of their fathers! In the second place, note that these men complained among themselves. This is evident from the next verse: “When Jesus knew in himself that his disciples murmured at it.” They did not come directly to Christ and openly state their difficulties. They did not ask Him to explain His meaning. And why? Because they were not really anxious for light. Had they been so, they would have sought it from Him. Again we say, How like human nature today! When the Lord’s messenger delivers a word that is distasteful to his hearers, they are not manly enough to come to him and tell him their grievance, far less will they approach him seeking help. No, like the miserable cowards they are, they will skulk in the background, seeking to sow the seeds of dissension by criticizing what they have heard. And such people the servant of God will have no difficulty in placing: they may wear the badge of disciples, but he will know from their actions and speech that they are not believers!
Arthur W. Pink (1886 -1952) Commentary on The Gospel According to John