摩訶止觀 6.66

6.66

既言幻化，豈當有、無？不當有故，不從有有；不當無故，不從無無。如此觀慧能破諸法見思，成惑智、因果等無生，是名非有非無門破假觀意。

Having said they are illusory transformations, how could they be existent or non-existent? Because they should not be existent, they do not exist from existence; because they should not be non-existent, they are not non-existent from non-existence. Contemplative wisdom such as this can break the views and thoughts of dharmas, bringing about the non-arising of delusion, wisdom, cause, effect, and so forth; this is the purpose of the contemplation breaking down the provisional through the gate of neither existence nor non-existence.