This perspective explains sôphrosunê's inclusion in Plato's canon of virtues, and before that its frequent appearance in funerary inscriptions, elegiac poetry, tragic drama, and historiography. It also explains the analytic attention given to it by Heraclitus, the Sophists, the historians, Socrates, Xenophon, and Plato. Moore deals principally with the classical period, though the book includes one chapter addressing earlier poetry and another addressing the virtue in two gender-sensitive post-classical works. An appendix deals with the epigraphic material.
For the Greeks (and perhaps for us) there is a virtue of agency, an acquirable capacity to be guided by what's best. Hardly just a concern for reticence and reserve, commitment to sôphrosunê is a commitment to whatever it is that makes us truly ourselves.