摩訶止觀 3.70

3.70

從空入假，名「平等觀」者，若是入空，尚無空可有，何假可入？當知此觀為化眾生，知真非真，方便出假，故言從空分別藥病而無差謬，故言「入假」。「平等」者，望前稱平等也。前觀破假病，不用假法，但用真法；破一、不破一，未為平等。後觀破空病，還用假法，破、用既均，異時相望，故言「平等」也。

Regarding entering the provisional from emptiness being called the 'contemplation of equality': if one enters emptiness, there is not even emptiness to be had, so what provisionality could there be to enter? One should know that this contemplation is for the sake of transforming sentient beings. Knowing that the true is not [ultimately] true, one employs expedient means to emerge into the provisional. Therefore it is said that from emptiness one distinguishes medicines and illnesses without error, which is why it is called 'entering the provisional'. 'Equality' is named so in comparison to the former [contemplation]. The former contemplation destroyed the illness of the provisional without employing provisional dharmas, employing only true dharmas; destroying the one and not destroying the other was not yet equality. The latter contemplation destroys the illness of emptiness and returns to employing provisional dharmas. Destruction and employment are thereby equalised, and viewed across different times, it is therefore called 'equality'.