瑜伽論記 16.285

16.285

下明轉根所以，即有五因。初因於鈍不喜足，復四，於利欣求為引勝定，故求勝根轉得利根。尋攬三藏，多聞不妄，捷疾論議，觀智真如智，名甚深法忍，如從退種求思，而須練根，從聲聞求獨覺，或迴心向大，亦須練根。

Below, explaining the reasons for transforming the faculties: there are five causes. The first cause is not being satisfied with dullness; further, the four consist in rejoicing in and seeking keenness to induce superior concentration, and therefore one seeks superior faculties and transforms them to obtain keen faculties. Searching and grasping the three baskets, hearing much without forgetting, swiftness in debate, the wisdom of contemplation and the wisdom of tathatā are called profound dharma-patience. Just as one must refine faculties when seeking [the stage of] reflection from the gotra of falling away, one must also refine faculties when seeking [the stage of] solitary buddhas from [that of] hearers, or when turning the mind toward the Great [Vehicle].'