Laṅkāvatāra Sūtra
The "Laṅkāvatāra Sūtra" describes the various tiers of consciousness in the individual, culminating in the "tathāgatagarbha" "buddha-womb" (i.e., buddha-nature) or "storehouse consciousness" (Skt. Ālayavijñāna), which is the base of the individual's deepest awareness and one's ties to the cosmic.