Stoic Six Pack 5 - The Cynics presents the key primary sources of this ancient philosophy, as well as secondary material to provide insight and understanding: An Introduction to Cynic Philosophy by John MacCunn, The Moral Sayings of Publius Syrus, a Roman Slave by Publius Syrus,Life of Antisthenes by Diogenes Laërtius, Book IV of The Symposium by Xenophon, Life of Diogenes by Diogenes Laërtius and Life of Crates by Diogenes Laërtius.