“Jesus said to them, ‘If God were your Father, you would love Me; for I proceeded forth and have come from God, for I have not even come on My own initiative, but He sent Me. Why do you not understand what I am saying? It is because you cannot hear My word. You are of your father the devil, and you want to do the desires of your father. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. Whenever he speaks a lie, he speaks from his own nature; for he is a liar, and the father of lies. But because I speak the truth, you do not believe Me.’”-John 8:42-45
In short—They do not hear or believe Him because they are not ‘of God’, or chosen by the Father (John 6:44, 6:65, 10:29). This is comforting for apologists and evangelists in several ways:
First—we, unlike Jesus, do not know who the ‘elect’ or the ‘chosen’ are.
In this sense we can never declare something like this…but,
Second—this means that our hard work in learning a classical, Van Tillian, or ‘Masters Way’ approach, and our effort in speaking the gospel of the Kingdom of God is not ‘useless’. Rather, we are to do the hard work, and persistently, but unbelief is to be expected of the un-elect.
Third—the principle of children of God vs. children of the Devil is first laid down in Genesis 3:15. But for apologists and evangelists this principle means that when a person does believe the gospel, it is evident that they are chosen by God, and regenerated (‘born from heaven’ or ‘born again’) by the Holy SPirit. If this is the case we can rejoice! For no one can snatch God’s children out of His hand, and the next call to persistent discipleship is then a joy.