金剛經纂要刊定記 3.144

3.144

五者，經從「須菩提！汝勿謂如來作是念：『我當有所說法』，乃至是名說法。」說而無說、無說之說，是真說法具足者。無法可說、無所不說，是名說法。

Fifth, the sūtra runs from: "Subhūti! You must not say the Tathāgata has this thought: 'I should teach some dharma'..." down to "...this is called teaching the Dharma." Teaching without teaching, the teaching of non-teaching, is the completeness of true teaching of the Dharma. Having no dharma that can be taught and leaving nothing untaught is called teaching the Dharma.