[379] Bhikkhus, if, while that bhikkhu dwells thus mindful, clearly comprehending, diligent, ardent, and resolute, there arises a neither-painful-nor-pleasant feeling (adukkhamasukhā vedanā), he understands thus: 'There has arisen in me this neither-painful-nor-pleasant feeling; and that is dependent, not independent. Dependent on what? Dependent on this very body. But this body is impermanent, conditioned (saṅkhata), dependently arisen (paṭiccasamuppanna). So when the neither-painful-nor-pleasant feeling has arisen in dependence on a body that is impermanent, conditioned, dependently arisen, how could it be permanent?' He dwells contemplating impermanence in the body and in the neither-painful-nor-pleasant feeling; he dwells contemplating vanishing (vaya); he dwells contemplating fading away (virāga); he dwells contemplating cessation; he dwells contemplating relinquishment (paṭinissagga). As he dwells contemplating impermanence in the body and in the neither-painful-nor-pleasant feeling … as he dwells contemplating relinquishment, the underlying tendency (anusaya) to ignorance in regard to the body and to the neither-painful-nor-pleasant feeling is abandoned.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.