Pahānasutta

Suttapiṭaka · Saṁyuttanikāya · Saḷāyatanavaggasaṁyutta · Vol. 18 · Section 364

[364] For one experiencing a pleasant feeling (vedanā) who does not understand that feeling, there is the underlying tendency (anusaya) to lust, in one who does not see the escape. For one experiencing a painful feeling who does not understand that feeling, there is the underlying tendency to aversion, in one who does not see the escape. As for that peaceful neither-painful-nor-pleasant feeling, taught by the one of vast wisdom — if one delights even in that, one is still not freed from suffering (dukkha). But when a bhikkhu, ardent, does not neglect clear comprehension, then that wise one fully understands all feelings. Having fully understood feelings, he is without taints (āsava) in this very life; standing firm in the Dhamma, a master of knowledge, with the breakup of the body he does not enter into reckoning. The third [sutta].

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.