妙法蓮華經玄義 2.129

2.129

無作者，迷中輕故，從理得名。以迷理故，菩提是煩惱，名集諦。涅槃是生死，名苦諦。以能解故，煩惱即菩提，名道諦。生死即涅槃，名滅諦。即事而中，無思無念，無誰造作，故名無作。《大經》云：「世諦即是第一義諦。有善方便，隨順眾生，說有二諦。出世人知即第一義諦。」一實諦者，無虛妄、無顛倒、常樂我淨等，是故名為無作四聖諦。

"Unconstructed" [truths]: because delusion regarding the middle is light, it receives its name from principle. Because of delusion regarding principle, bodhi is affliction, which is named the truth of accumulation; nirvāṇa is saṃsāra, which is named the truth of suffering. Because of being able to understand, affliction is precisely bodhi, which is named the truth of the path; saṃsāra is precisely nirvāṇa, which is named the truth of cessation. It is precisely phenomena and the middle, devoid of thought and devoid of deliberation, with no one constructing anything; therefore it is named "unconstructed." The Great Sūtra states: "Conventional truth is precisely the ultimate truth. Possessing skillful expedients, in accordance with sentient beings, one speaks of there being two truths. Those who transcend the world know that it is precisely the ultimate truth." The one real truth is non-illusory, non-inverted, permanent, blissful, self, pure, and so forth; therefore these are named the unconstructed four noble truths.