大乘起信論別記 1.129

1.129

'Although there is defiled mind, it is constant and never reverses' reveals that it moves yet is constantly quiescent; for this reason, only a Buddha completely understands it. As the Ten-fascicle Laṅkāvatārasūtra says: 'Because the tathāgatagarbha is a characteristic of purity, adventitious afflictions defile it so that it is impure. Relying on this meaning, I explained to Queen Śrīmālā and other bodhisattvas that the tathāgatagarbha and ālayavijñāna arise together with the seven consciousnesses, which is called the characteristic of evolving and ceasing. Mahāmati, as for the realm of the tathāgatagarbha and ālayavijñāna, I now, together with you and the bodhisattvas of profound wisdom, can understand and discriminate these two kinds of dharmas; all other śrāvakas, pratyekabuddhas, non-Buddhists, and those attached to names cannot understand these two dharmas.' This is precisely what it means!