And the king made silver to be in Jerusalem as stones, and cedars made he to be as the sycamore trees that are in the lowlands, for abundance.
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Ephrem The Syrian
This means that the knowledge of divine things must be imparted to all nations everywhere through the advent and manifestation of Christ; and Isaiah predicted the coming of Christ in the clearest way by saying, “The earth will be full of the knowledge of the Lord as the waters cover the sea.” The Scripture usually employs the symbol of silver to signify the holy doctrine [of Christ]. Indeed it is a pure, bright and sonorous metal, and its qualities are extraordinarily appropriate to Christ’s gospel. Haggai predicted that the temple of the Lord, which is the church of Christ, must be filled with this kind of silver. - "On the First Book of Kings 10.27"
Sycamores, (Hebrew shikmim) which were formerly very common in Palestine, as they are still about Cairo, in Egypt. The fruit resembles figs, as the leaves do the mulberry tree; whence the name is a compound of sukon, "a fig "and moria, "a mulberry "though some would prefer moros, "a fool "to denote that the fruit is "insipid. "It is however sweeter than wild figs, and proceeds from the trunk of the tree. (Calmet)