"I will give to thee the keys of the kingdom of heaven." Among the principal nations of antiquity, and particularly among the Hebrews, it was a received usage that the tradition of the keys denoted the transfer or acknowledgment of supreme power over the house, citadel, or city to whose gates they belonged. These keys, when made of precious metal, and, as was often the case, richly ornamented, were a symbol of power and dignity, and carried only by kings, princes, and magistrates. In the Hebrew monarchy, the chief of the royal household, who was a kind of grand chancellor of the kingdom, or vicar of the king, carried a large key on his shoulder as a badge of his office. {205} In the Prophecy of Isaias,[C. xxii.] we read this prediction concerning Eliacim, son of the high-priest Helcias: "I will place upon his shoulder the key of the house of David, and he shall open and there shall be no one who shall shut, and he shall shut and there shall be no one who shall open, and he shall be on the throne of glory of his father's house." This probably signifies that Eliacim should become high-priest in his father's place; and gives us a plain proof that the keys were an emblem of the sovereign pontificate in the Jewish Church. In the Apocalypse of St. John, the same emblem of the keys is used to designate the sovereign pontificate of Jesus Christ Himself: "These things saith the Holy One and the True One, He that hath the key of David; He that openeth, and no man shutteth; shutteth, and no man openeth." [Footnote 81] [Footnote 81: Apoc. iii. 7.] [USCCB: Revelation iii. 7.]