維摩經略疏垂裕記 6.78

6.78

二、「故大」下，引證。荊溪云：問其心既深，何不名根？答：得名處別，故不云耳。根名能生，性謂不改，故亦名深心。未有可生，非根也。

Second, from "Therefore the great" onward adduces proof. Jingxi says: "Question: Since their mind is already profound, why is it not called 'faculties'? Answer: Because the points from which they derive their names differ, it is not called that. 'Faculties' means capable of producing, and 'nature' means unalterable; hence it is also called profound mind. Before there is anything that can be produced, it is not a faculty."