[Apocryphal Chinese compositions] are forgeries in the sense of not being the actual words of the historical Buddha, to be sure, but not forgeries in the sense of the content being false or of teaching a “counterfeit dharma.” After all, as the [Treatise on the Great Perfection of Wisdom] says:
The Buddha-dharma is not limited to the words spoken by the Buddha; all true and good words , subtle and pleasant words in the world are part of the Buddha-dharma. [T. 25, 66b2-3]
Foundations of T'ien T'ai Philosophy, p 42