because
John 10:4
And when he putteth forth his own sheep, he goeth before them, and the sheep follow him: for they know his voice.
John 10:27
My sheep hear my voice, and I know them, and they follow me:
John 6:37
All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out.
John 6:44
No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.
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.
John 6:65
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 8:47
He that is of God heareth God's words: ye therefore hear them not, because ye are not of God.
John 12:37-40
37
But though he had done so many miracles before them, yet they believed not on him:
38
That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed?
39
Therefore they could not believe, because that Esaias said again,
40
He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.
Romans 11:7
What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded
Romans 11:8
According as it is written, God hath given them the spirit of slumber, eyes that they should not see, and ears that they should not hear;) unto this day.
2 Corinthians 4:3
But if our gospel be hid, it is hid to them that are lost:
2 Corinthians 4:4
In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
1 John 4:6
We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.