妙法蓮華經玄義 4.74

4.74

不用處，以樂三昧破者，此處如癡，癡故是苦，乃至無明苦。例如上（云云）。

For the sphere of nothingness, it is destroyed by the bliss samādhi: this sphere is like stupidity, and being stupid, it is suffering, up to the suffering of fundamental ignorance. The analogy is as above, and so on.