Lengyan is a simile for the hardest treasure, used to illustrate the indestructible and unbreakable firmness of the Tathāgatagarbha (Suchness Storehouse). The Lengyan Samādhi discussed in the Śūraṅgama Sūtra refers precisely to the unmoving, immutable nature of the Tathāgatagarbha. The Tathāgatagarbha constantly abides in samādhi. It does not correspond to the six dusts (objects of the senses), never scatters its attention to grasp at them, and is never dull, agitated, or distracted. Towards the six dusts, it is thoughtless, unperceiving, and unknowing. This samādhi of the Tathāgatagarbha has neither an entry point nor an exit point. No person, thing, or event can disrupt its meditative absorption, force it out of samādhi, or cause it to become scattered or lax. Therefore, the Tathāgatagarbha neither needs to receive precepts nor uphold them, because it never violates them.
To realize this great Lengyan Samādhi, one must investigate Ch'an (Zen) to clarify the mind and perceive the self-nature, thereby realizing the Tathāgatagarbha. In this way, one attains the Lengyan Samādhi. At this point, one reaches at least the seventh stage of abiding (Saptama Vihāra) among Bodhisattvas. Subsequently, there are the Ten Grounds of Abiding (Daśa Vihāra), the Ten Grounds of Practice (Daśa Caryā), the Ten Grounds of Dedication (Daśa Pariṇāmanā), the Ten Grounds of Bhūmi (Daśa Bhūmi), the stage of Equal Enlightenment (Samyaksaṃbodhi), and then the stage of Wondrous Enlightenment (Adhiṣṭhāna). Finally, one attains Buddhahood.
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