瑜伽師地論略纂 12.164

12.164

論云「所知障品麁重有三：在皮、在膚、在肉」者，何故煩惱障不言在皮等？義曰：煩惱有品，以三品言之，今此障不然，故以在皮等言也。

Regarding the treatise's statement, "The unwholesome states of the category of the obstacle to knowables are three: in the epidermis, in the skin, and in the flesh": Why does the affliction obstacle not speak of being in the epidermis, etc.? The meaning is: afflictions have grades, and are spoken of in terms of three grades; this obstacle is not like that, so it is spoken of as being in the epidermis, etc.