It is written in Ezekiel,

King of Tyre, thou sealest up thy sum, full of wisdom and perfect in beauty. Thou hast been in Eden, the Garden of God; every precious stone was thy covering, the ruby, the topaz and the diamond; the beryl, the sardonyx and the jasper; the sapphire, the chrysoprasus and the emerald, and gold. Ezek. xxviii 12, 13.

By Tyre in the Word are signified the cognitions of truth and good; by the king is signified the truth of the Church; by the Garden of Eden are signified wisdom and intelligence from the Word; and by precious stones are signified truths translucent from good, such as are in the sense of the Letter of the Word. Because this is the signification of those stones therefore they are called his covering; and it may be seen in a preceding article that the sense of the Letter covers the interior things of the Word.