Adam Clarke on John 6:65

Therefore said I unto you - Joh 6:44. See the note there.

Except it were given unto him - None can come at first, unless he be drawn by the Father; and none can continue, unless he continue under those sacred influences which God gives only to those who do not receive his first graces in vain. St. Augustin himself grants that it was the sole fault of these disciples that they did not believe, and were saved. Quare non Poterant credere, si a me quaeratur, cito respondeo, quia Nolebant. If I be asked why these could not believe, I immediately answer, because they Would Not. Aug. Tract. 53, in Joan.