Charles Ellicott Commentary John 6:65

"And he said, For this cause have I said unto you, that no man can come unto me, except it be given unto him of the Father." — John 6:65 (ASV)

No man can come unto me.—Unless the fields had been prepared, it was in vain to sow the seed. No effort on the sower’s part could make them receptive. The fact that they did not believe declared that their hearts were not prepared, but it did not affect the goodness of the seed. This defection did not surprise Him. He had already used words that anticipated it. (Compare to the note on John 6:37; John 6:44.)

It will be observed that this verse follows in the teaching of Christ immediately after the first clause of John 6:64, the second clause being a statement of the writer.