Christ, though clothed with our flesh, yet being also the eternal Son of God, knew by virtue of his Divine nature, personally united to the human nature, what was in the heart of man; hence is this phrase, knew in himself; which is opposed to a knowledge from the hearing of his own ears, as man heareth, whether more immediately from the sound of their words, (for we read of nothing they spake audibly), or from the relation of others, as what they had heard: he knew in himself their thoughts by his Divine prerogative and property of searching the hearts, and trying the reins, and discerning the thoughts of men afar off. Knowing their thoughts, he saith, Doth this give you occasion of stumbling?
Related Commentaries of John 6:61
John 6:61
61 When Jesus knew in himself that his disciples murmured at it, he said unto them,Doth this offendb you?