2.If you keep in memory unless in vain (9) These two expressions are very cutting. In the first, he reproves their carelessness or fickleness, because such a sudden fall was an evidence that they had never understood what had been delivered to them, or that their knowledge of it had been loose and floating, inasmuch as it had so quickly vanished. By the second, he warns them that they had needlessly and uselessly professed allegiance to Christ, if they did not hold fast this main doctrine. (10)

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