it's a metaphor

When a new Pope has been chosen, and the bells of St. Peter’s chime, he is shown into a small chamber next to the Sistine Chapel. They call it the Room of Tears, named for the sublime mixture of joy and sorrow that he must contemplate at this moment. He is brought a key to this box. It has been said that this box contains the ultimate secret. It holds the secret of the end of the world. This piece of paper reveals the precise nature of the Anti-Christ.

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