Today, people do not synthesize information in the same fashion as we did the time of Socrates. In the time of the ancient Greek philosophers and the great minds of Ancient Rome, minds were taught to be self-reliant (no manual, no study guide attached), with the exception of some text, primarily used to communicate personal thought and revelation over time and distance. It was sparse, and only for the well educated aka the rich. Today conversely, text is everywhere. We read something every five seconds: an advertisement, a magazine cover, the label of a candy-bar, a text message, a blog post, someone’s quippy t-shirt, another text message, et cetera. Text is so ubiquitous that it is impossible to go one day in the modern world (unless you go Walden on society and live alone in the woods), without reading something.
However, this is not the overriding disparity between reading today and reading 2400 years ago, degree. What’s more significant is the “type of library” we have accumulated in our minds. In the time of Socrates, even the time of Homer, a great mind had dense knowledge of a subject; for instance, the Iliad was not recorded in writing for hundreds of years… it was remembered. Whole books were memorized by scholars. At that time, it was normal. The difference is: today we have limited (as in not verbatim) knowledge of hundreds of written sources, back then they knew ten books by heart. If their mind was a library, they would have one shelf of complete books, along with their personal interpretations of them and the conclusions they arrived at with their knowledge. If a modern day reader’s mind was a library, we would have a whole bookcase of one page summaries of famous literature, contemporary media (blog posts, essays, Youtube, etc), and textbook lessons, along with many, many conclusions we have drawn from them. We have a diverse and cosmopolitan knowledge, but it is limited in depth. Ancient minds had immense understanding, based on thousands of memorized lines and interpretations. They made conclusions we marvel at today, but in a sense, we know more than they do.
Their knowledge is a well. Our knowledge is the top of an ice rink.