摩訶止觀 6.82

6.82

如上依無生門破見思者，即是空門。一門一切門，不獨無生而已。一破一切破，非止破見思而已。從假入空，一空一切空，非但空空生死而已。如是義者，即是圓教四門，正是今之所用也。

As explained above, breaking [delusions of] view and thought by relying on the gate of non-arising is itself the gate of emptiness. One gate is all gates; it is not non-arising alone. One breaking is all breaking; it does not stop at breaking view and thought alone. Entering emptiness from the provisional, when one is empty, all are empty; it is not merely emptying the emptiness of birth and death. Such a meaning is the four gates of the perfect teaching, and is precisely what is used now.