john 6:45 It is written in the prophets, And they shall be all taught of God. Every man therefore that hath heard, and hath learned of the Father, cometh unto me. - Free Bible Online

      45. written in the prophets--in Isa 54:13; Jer 31:33, 34; other similar passages may also have been in view. Our Lord thus falls back upon Scripture authority for this seemingly hard saying.
      all taught of God--not by external revelation merely, but by internal illumination, corresponding to the "drawing" of Joh 6:44.
      Every man therefore, &c.--that is, who hath been thus efficaciously taught of Him.
      cometh unto me--with absolute certainty, yet in the sense above given of "drawing"; that is, "As none can come to Me but as divinely drawn, so none thus drawn shall fail to come."

JFB.