Sophrosyne an important topic for Plato. It is main subject of the dialogue "Charmides", wherein several definitions are proposed but no conclusion reached; however the dramatic context connotes moral purity and innocence. An etymological meaning of sophrosyne as "moral sanity" is proposed in "Cratylus" 411e. Plato's view of sophrosyne is related to Pythagorean "harmonia" ("Republic" 430e−432a, 442c) and closely linked with Plato’s tripartite division of the soul: "sophrosyne" is the harmonious moderation of the appetitive and spirited parts of the soul by the rational part (e.g., "Phaedrus" 237c−238e). For the Stoic, Zeno of Citium, "sophrosyne" is one of the four chief
Ancient Greek phonology and therefore can be seen in certain Homeric forms. These dialects are called "psilotic". Even later, during the Koine Greek period, disappeared totally from Greek and never reappeared, resulting in Modern Greek not possessing this phoneme at all. The Classical Greek aspirated and voiced stops changed to voiceless and voiced fricatives during the period of Koine Greek (spirantization, a form of lenition). Spirantization of occurred earlier in Laconian Greek. Some examples are transcribed by Aristophanes and Thucydides, such as for ('Yes, by the two gods!') and for ("virgin goddess!') ("Lysistrata" 142 and 1263), for ('sacrificial victim') ("Histories" book 5, chapter