The Pilgrim's Progress by John Bunyan

Next they went to the iron gate of the castle — which also needed to be
unlocked. Though this lock was very difficult to turn — yet the key
finally opened it. Then they pushed the gate open to make a quick
escape — but the gate, as it opened, made such a creaking, that it
awakened Giant Despair. Hastily rising to pursue his prisoners — the
Giant fell into one of his fits, and felt his limbs fail him, so that he was
unable to go after them.
Then the Pilgrims found their way back to the King's highway — and so
were safe — being out of Giant Despair's jurisdiction.
Now, when they had gone back over the stile, they began to discuss what
they should do to prevent others who would come after them, from
falling into the hands of Giant Despair.
So they agreed to erect a pillar there — and to engrave this warning
upon it: "Over this stile is the way to Doubting Castle, which is kept by
Giant Despair — who despises the King of the Celestial Country, and
seeks to destroy His holy Pilgrims!"
This being done, they sang:
"Out of the way we went, and then we found
What 'twas to tread upon forbidden ground;
And let them who come after have a care,
Lest heedlessness makes them, as we, to fare.
Lest they for trespassing his prisoners are,
Whose castle's Doubting, and whose name's Despair.”
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