首楞嚴義疏注經 8.348

8.348

The 'territory where two intersect' refers to the junction of the wind and fire wheels, which is precisely the site of the seven burning hells. Those slightly lesser among the nine parts of emotion are called 'light', which means eight parts of emotion falling into the hell with intervals. Those slightly greater are called 'heavy', entering the hell of unremitting suffering, which is precisely nine parts of emotion. This mention of 'unremitting' is in terms of undergoing suffering. However, this 'unremitting' is named in contrast to the aforementioned 'with intervals', as it is the seventh burning hell. Below this is the eighth, the fivefold Avīci Hell, also called Avīci, which is the most severe.