Sanming TonghuiVol. 1, On the Nature and Fortune of the Sixty Jiazi (verdicts & remarks)
Yi Hai Fire is the heat qi of Fire, favoring Earth and summer. Associated with Heavenly Virtue and Curved Foot. Yi Mao, Gui Si, Ding You, and Yi Hai: though Water and Fire are dead and severed here, they are nonetheless clear, luminous, and wondrous.
Fire dead and severed is bright within and dim without, reflecting light backward; Water dead and severed is pristine and lucid, clear enough to illuminate brows and beards. Hence they are pure, luminous, and wondrous.