" Do not decorate the walls of your house with the valuable stones from Eubœa and Sparta; but adorn the minds (breasts) of the citizens and of those who administer the state with the instruction which comes from Hellas (Greece). For states are well governed by the wisdom (judgment) of men, but not by stone and wood. "

― Epictetus , The Art of Living: The Classical Manual on Virtue, Happiness and Effectiveness