金剛經纂要刊定記 5.134

5.134

斷疑意者。若如汝言受持此經，及菩薩行苦行，便同捨身俱成苦果者。此義不然。以前捨身不達無相即成苦果，持說此法菩薩苦行達無我人，知忍無忍、彼岸非岸，直造本源，豈成苦果？故云忍辱非忍辱等。

The intention in resolving the doubt: If, as you say, upholding this sūtra and a bodhisattva's engagement in ascetic practice were the same as relinquishing the body and both resulted in a fruition of suffering, this would not be correct. Because previously relinquishing the body did not comprehend signlessness, it resulted in a fruition of suffering; but by upholding and expounding this teaching, a bodhisattva's ascetic practice comprehends the absence of self and person, knows that forbearance is non-forbearance and that the other shore is not a shore, directly reaching the fundamental source—how could it result in a fruition of suffering? Therefore it says: "forbearance is not forbearance", etc.