because.

John 10:4, 27
When he has brought out all his own, he goes on ahead of them, and his sheep follow him because they know his voice. . . .

John 6:37, 44, 45, 65
Everyone the Father gives Me will come to Me, and the one who comes to Me I will never drive away. . . .

John 8:47
Whoever belongs to God hears the words of God. The reason you do not hear is that you do not belong to God."

John 12:37-40
Although Jesus had performed so many signs in their presence, they still did not believe in Him. . . .

Romans 11:7, 8
What then? What Israel was seeking, it failed to obtain, but the elect did. The others were hardened, . . .

2 Corinthians 4:3, 4
And even if our gospel is veiled, it is veiled to those who are perishing. . . .

1 John 4:6
We are from God. Whoever knows God listens to us; whoever is not from God does not listen to us. That is how we know the Spirit of truth and the spirit of deception.