What Does "Inner and Outer Consciousness-Mind" Refer To?

When the Buddha taught about the five hindrances in the Great Mindfulness Sūtra, He spoke of inner greed and outer greed, inner ill will and outer ill will, inner sloth-and-torpor and outer sloth-and-torpor, inner restlessness-and-remorse and outer restlessness-and-remorse, and inner doubt and outer doubt. What do "inner" and "outer" respectively refer to?

If the mind is divided into inner and outer, the outer mind refers to the mind consciousness that sentient beings can generally discover and observe, while the inner mind refers to the mind root (manas) that sentient beings find difficult to discover and observe. The two conscious minds are one manifest and one hidden, one bright and one dark, one deep and one shallow; one is easily changed, the other is firm and hard to change. Cultivation means first working on the shallow level of the mind consciousness, and then on the deep level of the mind root (manas): first initially transforming the mind consciousness, and ultimately and completely transforming the mind root (manas). Therefore, all afflictions and ignorance are, at first and most evidently, at the level of the mind consciousness, and at last and most hidden and profound, at the level of the mind root (manas).

From this sūtra, we can see that when the Buddha taught the Small Vehicle dharma, although He did not explicitly speak of the dharma of the mind root (manas), He still implicitly touched upon the mind root (manas), implicitly stating that all afflictions and ignorance belong to the mind root (manas), that eradicating afflictions means eradicating the afflictions of the mind root (manas), that liberation is the liberation of the mind root (manas), and that all dharmas must be brought down to the mind root (manas). If one resolves the problem of the mind root (manas), one can resolve all dharmas, and ultimately and completely attain nirvāṇa and liberation.