瑜伽論記 7.190

7.190

答第三問，念謂依身受持正法思惟法義，修作證中心無忘失也，初作身念住時要依教修，故思法義不忘名念。

Answering the third question: mindfulness refers to upholding the true Dharma and reflecting on the meaning of the Dharma relying upon the body, such that the mind does not forget while cultivating and realizing. When first practicing the application of mindfulness to the body, one must cultivate relying on the teachings; hence, reflecting on the meaning of the Dharma without forgetting is called mindfulness.