Episode 3: How the Book Created the Reformation, the Scientific Revolution, and the Individual

October 31, 1517, in front of the main door of the Castle Church in Wittenberg.

Did the sound of Martin Luther hammering his Ninety-Five Theses into the door really ring out? Historians debate whether the scene actually happened, but what matters is what came after. The fact is that Luther's arguments were printed on paper and spread across all of Europe like winged birds. What would have happened if there had been no printing press back then? Luther's voice would never have escaped the region of Wittenberg. The clergy might have branded his claims heresy and buried them with ease.

But the printed pamphlet was different. It was faster than speech, it lasted longer than memory, and anyone could hold it in their hands. A miner working in a German mining town and a farmer working in a French vineyard held scraps of paper that smelled of ink and read them. For the first time, they confirmed the word of God with their own eyes, not through a priest's interpretation.

Imagine it. A person who had believed his whole life that only the priest's words were truth, in the moment he realizes that the letters written in the book differ from what the priest says. What happened inside his head in that moment? Doubt toward authority begins to sprout. If what I read is right, why does the priest say something else? Whom am I to believe?

This question shook not only religion but the entire way of life. The printing press returned the right to interpret God to the masses. This was, in effect, a declaration that an individual's conscience could take precedence over the institutionalized church. People no longer existed merely as part of a collective faith. They began to stand as individual beings capable of judging truth for themselves.

While the flames of the Reformation were burning Europe, a quieter but more fundamental change was taking place elsewhere. It was the Scientific Revolution.

Up until the Middle Ages, knowledge existed as manuscripts. In the process of copying books by hand, errors were inevitable. One wrong letter changed the meaning, and that error was copied again and spread. Knowledge was not fixed but fluid, and it could not be trusted. But the printing press produced perfectly identical copies without limit. Galileo's observational data, Copernicus's heliocentric theory, Newton's equations — all were transmitted intact, without error.

Scientists could now turn the pages and compare one another's research. A scholar in London could precisely verify the experimental results of a scholar in Paris. Errors were pointed out, and discoveries accumulated. Knowledge no longer perished inside an individual's head. Recorded permanently on that external storage device called the book, it became a stepping stone for the next generation.

Isaac Newton said he was merely standing on the shoulders of giants. That giant was precisely the accumulation of printed knowledge. Without the printing press, there would have been no Scientific Revolution. The sharing of knowledge, its criticism, and its accumulation. As these three elements combined, humanity raised the speed at which it understood nature exponentially.

But there is one more thing worth noting here. It is the change in the way of reading.

Before the printing press, reading was making sound. Letters were symbols for producing sound, and reading was the act of performing before an audience. But as printed books spread, people began to read quietly. Silent reading, tracking the letters with the eyes alone, became an everyday practice.

What does it mean to read a book quietly? It is the act of shutting out external noise and concentrating on the inner voice. A space is created where only the author within the book and I are in conversation. This gave birth to the private realm — that is, to the concept of privacy. People at last came to possess their own thoughts, their own beliefs, their own inner world.

This is the birth of the individual. The printing press did not simply spread information; it created an independent self within the human being. For medieval people, "we" mattered more than the concept of "I." But the human being awakened through printed books began to ask, "Who am I?" This question, passing through the Enlightenment, completed a human-centered worldview and became the foundation of democracy and capitalism.

Looking back, all of this was a process of taking the functions of the human brain and externalizing them. We entrusted memory to books and entrusted interpretation to individual reason. Human beings began to merge with technology, moving beyond their biological limits. The book was an expanded edition of the human brain, and the library was an early form of collective intelligence.

And this current did not stop here. At the point when the externalization of knowledge was nearing completion, human beings once again tried to surpass their own limits. This time it was the limit not of the brain but of the body. If knowledge had been expanded with books, the next turn was to expand power with machines.

In the eighteenth century, black smoke began to rise from the factories of Manchester, England. The steam engine began to move, and humanity declared the liberation of muscle. If the printing revolution unlocked the shackles of the human mind, the Industrial Revolution unlocked the shackles of the human body.

Knowledge was now preparing to move beyond the bookshelf and into electrical signals. After the birth of the individual was complete, we were preparing to be connected once again. What is waiting at the end of that connection?

Next installment: (Chapter 1: The Externalization of Knowledge — The Printing Revolution) The Democratization of Knowledge, the First Expansion of the Human Brain