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.

8793. ‘Super ¹ montem Sinai’: quod significet in bonum cui verum implantandum, constat ex significatione ‘montis Sinai’ quod sit bonum in quo vera fidei implantanda, de qua supra n. 8753; de vero quod implantandum bono, agitur in capite sequente; decem praecepta ² monte Sinai tunc promulgata sunt vera interna, et leges ac statuta quae in capitibus sequentibus mandantur sunt vera externa; per haec et ³ illa significantur vera quae bono implantanda sunt.

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