妙法蓮華經玄義 7.63

7.63

四、本感應者，既已成果，即有本時所證二十五三昧，慈悲誓願，機感相關，能即寂而照，故言本感應也。

Fourth, original stimulus and response: having realized the fruition, there are the twenty-five samādhis realized at the original time, the compassionate vows, and the mutually related spiritual capacities and stimuli; being able to illuminate while in quietude, it is therefore called original stimulus and response.