妙法蓮華經玄義 10.136

10.136

從三歸三，本是即空即假即中之三，眾生不解，即開次第之三；又不解，即開體真之三；又不解，即開析法之三。利人從析空之三，入體空之三。從體入次，從次入即。鈍者住析三，故用即空三調之，即生蘇。又用次三調為熟蘇，今方得入即空即假即中。此約三法論開合也。

Returning to the three from the three: originally it is the three of identity with emptiness, identity with conventional existence, and identity with the middle. Sentient beings do not understand, so one opens the sequential three; still not understanding, one opens the three of perceiving truth; still not understanding, one opens the three of analyzing dharmas. Sharp persons pass from the three of analyzing emptiness into the three of perceiving emptiness; from perceiving, they enter the sequential; from the sequential, they enter identity. The dull abide in the analytical three; therefore one uses the three of identity with emptiness to condition them, which is raw butter; one further uses the sequential three to condition them into clarified butter; and only now do they gain entry into identity with emptiness, identity with conventional existence, and identity with the middle. This is discussing opening and merging in terms of three dharmas.