成唯識論述記 7.294

7.294

述曰：其文可知。然約修時及當來果以辨三品，此約三根為三無失，或根不定，但修有三，如五十三說：三品修同。然此受果通立、坐、臥，唯無行者，因修爾故。

The Commentary states: Its text can be understood. However, distinguishing the three grades in terms of the time of cultivation and the future fruit: taking the three faculties as three is without fault; or the faculties are not determinate, but cultivation has three grades, as stated in fascicle fifty-three: the cultivation of the three grades is identical. Furthermore, receiving this fruit extends to standing, sitting, and lying down, lacking only walking, because of the cultivation in the causal stage being thus.