大乘起信論略述 1.132

1.132

論。云何為五至不覺心動故　述曰。下釋五意即分為五。此初也。無明力者舉所依緣也。明心不自起。起必有緣。不覺心動者。正明起相釋其業義。謂起動義是業義故。

The treatise says: "What are the five? [...] the non-awakened mind moves."

The commentary says: Below explains the five manas, being divided into five. This is the first. "The power of avidyā" brings up the relied-upon condition, clarifying that the mind does not arise of itself, but necessarily arises through conditions. "The non-awakened mind moves" directly clarifies the aspect of arising and explains the meaning of "karma," because the meaning of movement is the meaning of karma.