Well if they don’t follow through, it just proves they are not his sheep.But they don't always follow through. You can buy everyone's ticket in full but it doesn't mean they all accept it.
But to the sheep, those whose random has been paid. They will come.
Simon Peter answered him, “Lord, to whom shall we go? You have the words of eternal life, and we have believed, and have come to know, that you are the Holy One of God.” John. 6.