Xenophon, like Plato, was a student of Socrates. For whatever reason, his work is not nearly as famous, even though it is far more applicable. Unlike Plato, Xenophon studied people. His greatest book is about the latter, it’s the best biography written of Cyrus the Great (aka the father of human rights). There are so many great lessons in here and I wish more people would read it. Machiavelli learned them, as this book inspired The Prince.