金剛經纂要刊定記 6.126

6.126

了因者。了有二義：一、了斷義，以般若能了煩惱空故。二、顯了義，能顯法身故。今無我等即是此義，亦名正因。正由此慧除妄得法身，故今云正道，道即因義。

"Revealing cause" (vyajñaka-hetu) has two meanings: first, the meaning of terminating, because prajñā can discern the emptiness of afflictions; second, the meaning of manifesting, because it can manifest the Dharmakāya. Here, "without self," etc., is precisely this meaning, also named the primary cause. Precisely due to this wisdom eliminating delusion and obtaining the Dharmakāya, it is now called the correct path; "path" has the meaning of cause.