The Ten-Foot Chain by Max Brand

_This is the tale which Jehan Tugluk Khan, a wise man in Tartary, and milk brother to Ghengiz Khan, Emperor of the East and the North, and Captain General of the Golden Horde, whispered to the Foolish Virgin who came to him, bringing the purple, spiked flower of the Kadam-tree as an offering, and begging him for a love potion with which to hold Haydar Khan, a young, red-faced warrior from the west who had ridden into camp, a song on his lips, a woman's breast scarf tied to his tufted bamboo lance, a necklace of his slain foes' skulls strung about his massive chest, and sitting astride a white stallion whose mane was dyed crimson in sign of strife and whose dainty, dancing feet rang on the rose-red marble pavement of the emperor's courtyard like crystal bells in the wind of spring._

_This is a tale of passion, and, by the same token, a tale of wisdom. For, in the yellow, placid lands east of the Urals and west of harsh, sneering Pekin, it is babbled by the toothless old women who know life, that wisdom and desire are twin sisters rocked in the same cradle: one speaks while the other sings. They say that it is the wisdom of passion which makes eternal the instinct of love._