(19) The Tablet of Isis was originally a table or altar, and its emblems were part of the mysteries explained by priests. Tables were dedicated to the various gods and goddesses; in this case Isis was so honored. The substances from which the tables were made differed according to the relative dignities of the deities. The tables consecrated to Jupiter and Apollo were of gold; those to Diana, Venus, and Juno were of silver; those to the other superior gods, of marble; those to the lesser divinities, of wood. Tables were also made of metals corresponding to the planets governed by the various celestials. As food for the body is spread on a banquet table, so on these sacred altars were spread the symbols which, when understood, feed the invisible nature of man.