Curiosity Killed the Cat?

Jack Budington
September 14, 2022

Sometime towards the end of the Middle Ages, there lived a very special cat. For the purpose of this fictitious story, we’ll call her Luna. Now, this grimlikan wasn’t like the other cats in her village. They scurried about, avoiding the noise and dangers of human activity. Luna held her head—and tail for that matter—as high as possible.

She explored the areas that no other feline dared go. She’d walk the busy streets of the farmer’s market, she’d stick her head in the butcher’s workshop looking for scraps, she’d visit the granary and stalk rodents. All her fellow felines agreed, Luna was one curious cat.

And then one day, during one of these non-conforming adventures, she ran out of lives. Was Luna killed by her own curiosity?
It required two pages of definitions to finally see curiosity as a positive trait.
It required two pages of definitions to finally see curiosity as a positive trait.

No one knows definitively where the term “curiosity killed the cat” originated. The first reference comes from a comedic play. In 1598, English playwright Ben Johnson used the term “care kills the cat” in Every Man in his Humour. The word “care” in Johnson’s time would be defined as “nosiness” today. The line was part of a nonsensical sing-songy passage, and it’s unclear if he was quoting a common idiom or if he invented the phrase for syllabic balance.

Later, Shakespeare used the term in Much Ado About Nothing. It’s possible he borrowed the idea from Johnson, but it’s equally possible that this was a commonly used phrase. Playwrights provide most of what we know about Middle English slang. So while it might be impossible to determine where the idiom began, we can make an educated guess as to why.

A century before Johnson penned his play, a young German metalworker was testing his new invention. Johannes Guttenberg converted an old wine press into an information delivery system. Prior to Gutenberg, all books—and thus ideas—were written out by hand. Gutenberg’s press reproduced writing mechanically and at a fraction of the cost. Soon, new ideas were flowing across the European continent.

Hartmann Schedel’s The Nuremberg Chronicle added a humanist perspective to many common folktales and biblical passages. Martin Luther’s handwritten 95-Point Thesis also found its way to a local printer, resulting in an entire nation of German citizens questioning the teachings of the Catholic Church. New ideas set free, political havoc and confusion reigned. And to make things worse for the incurious and disinterested old guard, growth in print and the resulting literacy created a demand for eyeglasses. It didn’t take long for those glassmakers to look for bigger opportunities. Specifically, they looked up.

In August of 1609, the Italian engineer Galileo was building a new tool in his workshop. By inserting a convex and a concave lens into a tube, the device could magnify far away objects. Galileo’s telescope was an immediate success.

Portrait of Galileo Galilei by Justus Sustermans (1635)
Portrait of Galileo Galilei by Justus Sustermans (1635)

Working with a group of nobles in Venice, Galileo demonstrated the power of his invention. Together, they climbed a tall church tower and began peering out at the horizon. Ships not visible to the naked eye appeared clearly in the telescope. The nobles immediately recognized the military importance of Galileo’s magnification device. But Galileo’s curiosity was much greater, or farther, depending on how you look at it.

A hundred years earlier, a Polish official named Nicolaus Copernicus made a remarkable discovery. He realized that explaining the strange celestial movements of the planets, which seemed to dance across the night sky, became far simpler if they were orbiting the sun rather than the earth. Without any tools to visually observe this theory, Copernicus used math to prove the sun—not the earth—was the center of our solar system. He understood the implications of what he had learned. The structure of the cosmos was not just a matter of scientific curiosity. He was challenging thousands of years of spiritual belief about our place in the universe. So Copernicus hid his discovery for the next 33 years.

He would go on to reform Poland’s financial system, design many of its fortifications, and even win glory as a war hero. But only on his deathbed did Copernicus dare publish his argument for a heliocentric universe. Galileo had a copy of Copernicus’ work and used his telescope to observe Copernicus’ idea with his own eyes. Later, he let his peers do the same and published his findings. Curious about what happened next?

Galileo spent the rest of his life under house arrest. While leaders in the Catholic Church attempted to hold back the wave of curiosity set loose during the Renaissance, new ideas, new questions, and contrary opinions to church doctrine were suddenly everywhere. The kinetic energy of thought unleashed by Guttenberg’s invention was unstoppable. Leibniz and Newton, Voltaire and Descartes, da Vinci and Vesalius—great minds across Europe felt free to challenge what was known, and curiosity went from a jailable offense to a desirable human trait.

It’s hard to imagine a world that learned only from its past—a world that believed that the ancients behind us had already answered all the questions. The early modern fear that curiosity would kill the cat proved to be unfounded. Rather than leading men into error and pride, it brought about a better world. Today we take it as a given that curiosity is a virtue rather than a vice. Our fear of change, however, has never left us. The same desire to resist new knowledge and cling to the existing ways of doing things is still a major force in our society today. Nostalgia, rather than curiosity, is the real danger.

So back to the original question: what happened to Luna? We believe whoever invented the term “curiosity killed the cat” was having a hard time with the changes brought about by Renaissance thinking. We believe Luna lived a long and happy life, and that the courage she demonstrated led many around her to question their own understanding of the world. So we want to thank Luna, along with all the women and men who followed her lead to make the world a better place.

Featured image: Galileo Galilei at his trial by the Inquisition in Rome in 1633. Photograph of a painting. Credit: Wellcome Library, London. Wellcome Images –

About the Author

Ever since Jack was a kid he has been absorbed in learning everything he can about the world. On family road trips he would constantly pester his parents with questions:

“How far away is it to the moon? How fast is Roger Clemens fastball? What is the oldest town in Connecticut?”

Luckily, for everyone involved, smart phones were invented.

However, Jack’s desire to understand the world never ceased.  As he grew older he became especially interested in history. To Jack history is a vast web of billions of stories with endless complexity. His time at Kenyon College solidified what he loves about studying history—finding patterns, omissions, and meaning in this vast web of stories.

Now as a writer for Mythos, Jack finds and share stories about what it means to create communities of belief and bind people together through values and ideas. Each week Jack hopes to learn something new and hopes you do too.

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