John the Apostle
John 6:65BSB·traditional attribution

Then Jesus said, “This is why I told you that no one can come to Me unless the Father has granted it to him.”

John Calvin Reformed @genevareformer

65. Therefore have I told you. He again states that faith is an uncommon and remarkable gift of the Spirit of God, that we may not be astonished that the Gospel is not received in every place and by all. For, being ill qualified to turn to our advantage the course of events, we think more meanly of the Gospel, because the whole world does not assent to it.

Matthew Henry Presbyterian @wholebiblehenry

We have here an account of the effects of Christ's discourse. Some were offended and others edified by it; some driven from him and others brought nearer to him. I. To some it was a savour of death unto death; not only to the Jews, who were professed enemies to him and his doctrine, but even to many of his disciples, such as were disciples...

Commenting on John 6:60-71

John Gill Reformed Baptist @doctorgill

Then said Jesus unto the twelve,.... "To his own twelve", as the Persic version reads; that is, to his twelve apostles, whom he had chosen to that office: Christ takes no notice of those that went away from him, he showed no concern about them; he knew what they were, that the truth of grace was not in them, and that they did not belong...