Xenophon,
Cyropaedia: The Education of Cyrus
“ Let not cold bite thee in winter nor heat inflame thee in summer,' I say there is no law that could compel us to obey; for it is our nature to be swayed by these forces. But love is voluntary; each man loves to himself alone, and according as he chooses, just as he chooses his cloak or his sandals." (12) "Then," said Cyrus, "if love be voluntary, why cannot a man cease to love when he wishes? I have seen men in love," said he, "who have wept for very agony, who were the very slaves of those they loved, though before the fever took them they thought slavery the worst of evils. ”
