The Pilgrim's Progress by John Bunyan

Hopeful lay, therefore, all day in the same lamentable state.
Now night had come, and when Mrs. Diffidence and her husband, the
Giant, went to bed — they began to renew their discourse about the
prisoners.
The old Giant wondered why he could neither, by his blows nor by his
counsel, bring them to an end.
And with that his wife reasoned, "I fear that they live in hope that
someone will come to rescue them — or that they have picklocks with
them, by which they hope to escape.”
"Do you think so, my dear?" responded the Giant, "I will, therefore,
search them in the morning."
Now, about midnight, the Pilgrims began to pray — and continued in
prayer until almost the break of day. Then Christian, half-bewildered,
broke out in this passionate speech: "What a fool I have been, to thus lie
in this stinking dungeon — when I could have been free! I have a key
called Promise in my bosom — which I am persuaded will open any lock
in Doubting Castle!"
Hopeful replied, "That is good news, my brother — pluck it out of your
bosom, and try it!"
Then Christian pulled it out of his bosom, and tried to unlock the
dungeon door. As he turned the key, the bolt drew back and the door
flew open! Christian and Hopeful quickly came out of the dungeon, and
went to the outer door which led into the castle-yard. Using his key,
Christian was able to open that door also.
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