What does Les say is hard for humans to comprehend about salvation?

Les teaches that the same unbelief that kept Israel from taking the land at Kadesh Barnea will be the sin of millions before the great white throne—good people whose sin is unbelief. He says they could not believe what God said concerning the work of the cross. Les grants that from the human element it is hard to comprehend that the Creator God took on flesh, was crucified, and by that act of death, suffering, and resurrection, God can pass salvation out to the whole human race. He also maintains every human being has already been pardoned by virtue of the work of the cross, but they must appropriate it by faith.