瑜伽師地論略纂 12.143

12.143

論云「難可了知一切分別現行隨逐身語意業皆悉安住，而不捨離」者，由有漸細分別難可了，知麁分別故，名為無相；前地等有麁分別，名有相。此皆隨順菩提之分別，故不捨離。

The treatise says: "The active manifestations of all difficult-to-comprehend conceptualizations follow upon physical, verbal, and mental karma, entirely abiding therein without being abandoned." Because there are increasingly subtle conceptualizations that are difficult to comprehend, knowing the coarse conceptualizations is called signless; the previous bhūmis have coarse conceptualizations, which are called having signs. These are all conceptualizations that accord with bodhi, and therefore they are not abandoned.