楞伽阿跋多羅寶經註解 3.41

3.41

示四等猶涉言詮，故復以始終不說一字之義為問。佛答以我因二法故，謂無法可說，是佛之說也。自得即自證修德也，本住即本具性德也，修性一如，皆離言說，故云「我如是說」。

Demonstrating the four equalities still touched upon verbal explanations, so he again raised the question concerning the meaning of not speaking a single syllable from beginning to end. The Buddha answered that it is because of two dharmas, meaning that having no dharma to be spoken is the Buddha's speech. "Self-attainment" is the cultivated virtue of personal realization; "fundamental abiding" is the fundamentally possessed virtue of nature. Cultivation and nature are as one, both transcending words, hence he says 'I speak in this way.'