Xenophon 
Memorable Thoughts of Socrates [PDF ebook] 

Ancient Greek historian and soldier Xenophon was a friend, admirer, and avid follower of the philosopher Socrates, perhaps the single most influential thinker of the period. As the two spent a great deal of time together, often deep in dialogue, Xenophon became one of the chief chroniclers of Socrates’ philosophical views. This volume collects a number of Socrates’ opinions on a variety of topics, as well as Xenophon’s explanations and analysis.