Therefore they could not believe, because Isaiah said again, 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. (John 12:39,40)
What then, are we better than they? (Romans 3:9)
So if there is no one who seeks, calls, comes to Him, chooses, receives or believes... how did we?
It was only by the power, gift, and grace of God.