Proverbs 26:11

11 Like a dog that returns to its vomit,
The simile is graphic and debasing (cf. 2 Peter 2:22).

so a fool repeats his folly.
The point is clear: Fools repeat their disgusting mistakes, or to put it another way, whenever we repeat our disgusting mistakes we are fools. The proverb is affirming that no matter how many times a fool is warned, he never learns.

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