大乘起信論義記 3.296

3.296

In the first part, the phrase "all Buddhas..." brings up the path of awakening toward which one sets forth. From "all bodhisattvas" onward, it reveals the causal practices that are capable of setting forth. Wishing to clarify that the categories of bodhisattvas generating the mind to set forth toward the Buddha and realizing the path are not identical, it therefore says "differentiating the marks of setting forth on the path."