63 It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.
64 But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him.
65 And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.
John Ch 6:63-65
The words are John’s quoting of Jesus Christ speaking to His followers. Quickeneth is a term for spiritual Life, to which our flesh/mind can contribute nothing positive.
The last line is of particular interest: “We” (our human body/human mind) do not choose to truly follow the word of God, of Jesus, except that God wills it to be so for us. (At a time of His choosing, not ours).
Our human mind has a very great capacity to be deceived – even by itself.