In most cases, "mouth" in the Bible represents thought and logic, especially the kind of active, concrete thought that is connected with speech. The reason for this is pretty obvious, but it also holds when people, for instance, remove a stone from the mouth of a well, which represents gaining access to spiritual ideas. The mouth is used for eating as well as speaking, of course. In those circumstances, it represents our first, most external perception of a new spiritual idea or desire. This also makes sense, mirroring the way tasting food in the mouth gives us an instant impression of the quality of the food.

8550. Unusquisque homo nascitur in mala amoris sui et mundi a suis parentibus; omne malum quod per habitum traxerat quasi naturam, derivatur in prolem, ita successive a parentibus, ab avis, et ab atavis, longa retro serie; inde derivatio mali tandem fit tanta ut omne vitae propriae hominis non sit nisi quam malum. ¹ Derivatum hoc continuum non frangitur et alteratur quam per vitam fidei et charitatis ² a Domino.

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