Christ according to Apocalypse 1, has the Key of David. The expression is suggested by Isaias 22, where Eliacim is represented as having "the Key of the house of David" slung over his shoulder, as a symbol of power. Christ is set over the House of God (Ephesians 1; Hebrews 3), and exercises all authority in heaven and on earth (Matthew 28) and even in the nether world (Apocalypse 1). The reference to David recalls the prophecies fulfilled in the exaltation of Christ.
This dictionary contains not only definitions and explanations of every subject in Religion, Scripture, tradition, doctrine, morals, sacraments, rites, customs, devotions and symbolism, but also accounts of the Church in every continent, country, diocese; missions, notable Catholic centers, cities, and places with religious names; religious orders, church societies, sects and false religions. It has brief articles also on historical events and personages, on the Old Testament and New, and on popes, prelates, priests, men and women of distinction, showing what the Church has done for civilization and correcting many errors which have hitherto passed for history.Wikipedia
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