משלי, פרק כ״ו, פסוק י״א

A sharp and repulsive image serves to illustrate the stubborn nature of repeating one's mistakes. A clear parallel is drawn between the behavior of a wandering dog and that of a foolish person. A dog naturally roams in search of food [ביאור שטיינזלץ]. Yet, it will return to eat its own vomit, completely failing to understand that it expelled the food in the first place because it was bad and damaging to its body [רלב״ג, מצודת דוד]. In the exact same way, a foolish person repeats his destructive behaviors. Even if a sharp scolding causes him to pause his actions for a brief moment, he quickly and shamelessly returns to them [אבן עזרא]. By doing so, he inflicts a deeply disgusting act upon his own soul, much like the physical disgust of consuming what the body has already rejected [עמנואל הרומי].

Beyond the simple physical comparison, this imagery reveals the deeper psychological motives driving such behavior. The fool is actually fully aware that his actions are empty and repulsive. Because of this awareness, there is no practical use in arguing with him logically or trying to correct his mistakes. He actively chooses to return to his bad habits despite knowing exactly what they are [מלבי״ם]. The specific detail of the dog returning to its own waste highlights that the fool would not adopt the foolishness of a stranger. Instead, he returns to his own personal bad habits simply because he has grown used to them, allowing them to become an ingrained part of his identity [אלשיך]. However, this specific detail also offers a faint glimmer of hope. Because the fool is drawn only to his own familiar foolishness and does not falsely pretend to be wise, there remains a slight possibility that his ways might one day be corrected [אלשיך].