Why will good people be condemned at the great white throne?
Good people are condemned at the great white throne because their sin is unbelief. Although the work of the cross has already accomplished pardon for every human being, they will not appropriate it by faith. They cannot believe what God has said concerning the cross, and that unbelief is their condemnation.
Les explains that millions of good people will come before the great white throne, but their sin is unbelief. He compares this to Israel at Kadesh Barnea: the golden calf was forgiven, but God's controversy was their refusal to believe He could give them the land. Likewise, these people cannot believe what God said concerning the work of the cross. Les grants it is hard from the human element to comprehend that the Creator God took on flesh, was crucified, died, suffered, and was raised so God can pass salvation to the whole human race. He maintains every human being has already been pardoned by virtue of the cross; the only reason they do not receive it is that they will not appropriate it by faith.