For whoever lacks these qualities is blind—shortsighted [closing his spiritual eyes to the truth], having become oblivious to the fact that he was cleansed from his old sins.

But these [false teachers], like unreasoning animals, [mere] creatures of instinct, born to be captured and destroyed, reviling things they do not understand, will also perish in their own corruption [in their destroying they will be destroyed],

The thing spoken of in the true proverb has happened to them, “The dog returns to his own vomit,” and, “A sow is washed only to wallow [again] in the mire.”