The video of post #20 asserts that even if a person has hardened their heart, they are not disabled from "coming to their senses" and returning to God's truth.
I see two conditions described in scripture. First, the one who is so hardened they cannot even grasp the gospel, such that they do not even understand it. I do not see how these would then ever come to their senses. However, others understand and reject it in whole or in part. These then could come to their senses. Examples of rejecting in part would be soils #2 and 3 from Matthew 13. Initial rejection upon understanding would be people like the rich young ruler. Those able to understand comprise the fields white for harvest. Those so hardened they cannot understand are those "not of My sheep" (not of those still able to understand God's truth). I believe their punishment in the afterlife will be more severe for those able to understand but still rejecting the gospel.
I see two conditions described in scripture. First, the one who is so hardened they cannot even grasp the gospel, such that they do not even understand it. I do not see how these would then ever come to their senses. However, others understand and reject it in whole or in part. These then could come to their senses. Examples of rejecting in part would be soils #2 and 3 from Matthew 13. Initial rejection upon understanding would be people like the rich young ruler. Those able to understand comprise the fields white for harvest. Those so hardened they cannot understand are those "not of My sheep" (not of those still able to understand God's truth). I believe their punishment in the afterlife will be more severe for those able to understand but still rejecting the gospel.