
Originally written by Campbell in the '40s-- in his pre-Bill Moyers days -- and famous as George Lucas' inspiration for "Star Wars," this book will likewise inspire any writer or reader in its well considered assertion that while all stories have already been told, this is not a bad thing, since the retelling is still necessary. And while our own life's journey must always be ended alone, the travel is undertaken in the company not only of immediate loved ones and primal passion, but of the heroes and heroines -- and myth-cycles -- that have preceded us. (Amazon.com review.)
Later in life, after becoming familiar with the work of Joseph Campbell (Hero with a Thousand Faces) and Jordan Peterson (c.f. his lectures that unpack Pinnochio, The Lion King and his Biblical series), I began to understand the underlying elements in the story that make it reach so deep into our psyches.
Theme 1: pure love as a purifying crucible. Love as the ultimate goal and the ultimate sacrifice. The boy loves the rabbit, but it goes from being new and shiny to being torn and ragged. But love makes it "real". In that sense it is not a sacrifice, but the achievement of a higher ideal.
Theme 2: rebirth and redemption. The Phoenix story. The rabbit is burnt, shedding everything but its purest essence. The tear symbolizes the remnants of attachments to its past self.
The Hero with a Thousand Faces by Joseph Campbell will ruin fiction for you, from the classic myth up to modern storytelling.
If you want to learn more, you might enjoy Joseph Campbell's The Hero with a Thousand Faces: https://en.wikipedia.org/wiki/The_Hero_with_a_Thousand_Faces
But his thesis is not that all mythology boils down to one simple story. His thesis is more like the website tvtropes: there are recurring identifiable patterns in cultural teaching stories.