Requoting Narnia from my BoU:

In the story, Puddleglum would believe in Aslan and the world he came from even if he’s in a world where neither is real.

Puddleglum’s words were the “Ontological Proof” in a form suitable for kids.

An example of Ontological Proof from from Ontological Proofs Today by Miroslaw Szatkowski:

Fantasy creates belief in its audience. It inspires change for different individuals.

3 septembers and a january(the sandman)

This story comes from the Sandman, and is a very inspiring tale about the story of how believing in a fantasy can change a person’s actions. I regard this story as secondary research because it has a true background story.

Joshua Abraham Norton, a resident of San Francisco, arrived in 1849 and thrived as a businessman. However, a failed attempt to monopolize the rice market led to financial ruin. In 1859, following this misfortune, Norton declared himself “Emperor of the United States.”

Despite lacking official power, San Francisco embraced Emperor Norton’s eccentricity. He received courtesies like free travel and meals, and even his self-proclaimed currency held value in some shops. While some viewed him as odd, others found amusement in his pronouncements and enjoyed his presence.

Emperor Norton’s reign may have been unofficial, but his impact was real. He became a beloved local figure, immortalized in the works of literary giants like Mark Twain and Robert Louis Stevenson. His story serves as a reminder of San Francisco’s unique character and its embrace of the unconventional.

https://en.wikipedia.org/wiki/Emperor_Norton(from Wikipedia, will find reference on this later)