成唯識論述記 2.931

2.931

The Commentary states: Below is the [treatise's] own explanation: tathatā, the principle of emptiness of the mind, is the mind, and the purity of the mind's nature is because it is the true nature; the Śrīmālādevī-sūtra explains this meaning in full. The tenth fascicle of the Abhidharmasamuccaya-bhāṣya, under the three transformations of the basis, explains the transformation of the basis of the mind as tathatā, calling it the fundamentally pure nature of the mind, because arisen defilements veil this pure mind, and now by severing defilements and delusions one realizes the pure nature of mind.