Arcana Coelestia #9476
9476. 'Shoham stones, and stones of fillings' means spiritual truths and forms of good in general. This is clear from the meaning of 'shoham stones' as truths of faith that spring from love, or spiritual truths since the truths of faith that spring from love are spiritual truths; and from the meaning of 'stones of fillings' as forms of the good of faith, or spiritual forms of good. The reason why forms of the good of faith are meant by 'stones of fillings' and the truths of faith by 'shoham stones' is that the stones of fillings were for the breastplate, and 'the breastplate' on the ephod meant the good of faith or spiritual good, whereas the shoham stones went on the shoulder-pieces of the ephod, and by 'the shoulder-pieces of the ephod' the truths of faith or spiritual truths are meant. For the meaning of precious stones in the Word as the truths and forms of the good of faith, or spiritual truths and forms of good, see 114, 643, 3858, 6335, 6640. And since the truths and forms of the good of faith are meant by precious stones, intelligence and wisdom are also meant by them; for intelligence grows out of the truths of faith, and wisdom out of forms of the good of faith. Such is the meaning in Ezekiel,
Full of wisdom and perfect in beauty, you were in Eden, the garden of God. Every precious stone was your covering - ruby, topaz, diamond, tarshish, shoham. Ezekiel 28:12-13, 15.
This refers to the king of Tyre, by whom intelligence that grows out of cognitions or knowledge of the truth of faith is meant, 1201.
Mouth
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.