4 In your struggle against sin, you have not yet resisted to the point of shedding your blood.
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And have you completely forgotten this word of encouragement that addresses you as a father addresses his son? It says, “My son, do not make light of the Lord’s discipline, and do not lose heart when he rebukes you,
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because the Lord disciplines the one he loves, and he chastens everyone he accepts as his son.”[a]
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Endure hardship as discipline; God is treating you as his children. For what children are not disciplined by their father?
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If you are not disciplined—and everyone undergoes discipline—then you are not legitimate, not true sons and daughters at all.