Spartans clearly knew their laws very well, they could debate in international forums, and their sayings were considered so witty that they were collected by their contemporaries. Indeed, some sources claim that “devotion to the intellect is more characteristic of Spartans than love of physical exercise.” (Plutarch, Lycurgus:20) Furthermore, Sparta is known to have entertained leading philosophers and to have had a high appreciation of poetry, as evidenced by the many contests and festivals for poetry, particularly in the form of lyrics. The abundance of inscriptions and dedications found in Sparta are clear testimony to a literate society; one does not brag about one’s achievements in stone if no one in your society can read!
Last but not least, while everyone agrees that Spartan education was designed to turn the graduates of the agoge into good soldiers, the skills needed by a good soldier included far more than skill with weapons, physical fitness, endurance, and obedience. A good soldier also had to be able to track, to read the weather from the clouds, to navigate by the stars, to recognize poisonous plants, to apply first aid, to build fortifications and trenches, and much, much more. All this knowledge was transmitted to Spartan youth in the agoge.
"Leonidas of Sparta: A Boy of the Agoge" is a novel based on hypothesizes about the agoge consistent with the above thoughts.