大乘起信論裂網疏 6.4

6.4

前文分別修行正道相中，明發心已入正定聚，雖亦略示不定位中所修之行，然未詳明，故今特為初機更示之也。

In the preceding text distinguishing the characteristics of practicing the correct path, it explained that upon generating the mind one enters the determinate stage; although it also briefly indicated the practice cultivated within the indeterminate stage, it did not explain it in detail. Therefore, here it especially indicates it further for those of initial capacity.