References:
"When he exerts himself he comes to realize with the body the ultimate truth, and he sees it by the penetrating of it with understanding. That is how there is discovery of truth. But there is as yet no final arrival at truth.
"How is truth finally arrived at? Final arrival at truth is the repetition, the keeping in being, the development, of those same ideas. That is how there is final arrival at truth." [Translated from the Pali by ~Nanamoli Thera]
[SN 47.37, Chanda Sutta:] "He remains focused on mental qualities in & of themselves--ardent, alert, & mindful-- subduing greed & distress with reference to the world. For him, remaining focused on mental qualities in & of themselves, any desire for mental qualities is abandoned. From the abandoning of desire, the deathless is realized." [chandassa pahānā amata.m sacchikata.m hoti]
[Mahasi Sayadaw:] "When the yogi by noting `seeing' at the moment of sight becomes convinced of the true nature of impermanence, suffering and anatta, he will not be blinded by the delusion of permanence, happiness and self in the sense doors and sense objects such as eye, visual object, eye-consciousness etc. He is momentarily free from avijja, ignorance or delusion. Having seen reality as it is and being free from delusion, no pleasurable feeling arises towards these objects. This is then the temporary cessation or fading away of craving. Through the fading away of craving, upādāna, clinging, kamma and sankhāra which come trailing after it cannot arise. Consequently viññāna, nāma-ruupa, salāyatana, phassa and vedanā, the unwholesome resultants of kamma and sankhāra, cannot appear. This is how craving together with suffering are momentary extinguished; that is called momentary cessation or momentarily Nibbāna.
"In a similar manner, the yogi, by noting `hearing', `smelling' `ear-consciousness', `nose-consciousness' etc, at the moment of hearing, smelling etc, becomes convinced of the true nature of impermanence, suffering and non-self with respect to ear, sound, nose, taste etc. He will be free from delusion of permanence, happiness or self in connection with these objects. Thus there will be momentary cessation of craving, and suffering otherwise called momentary Nibbaana.
"Through vipassanā which promotes temporary cessation as higher knowledge is developed, Nibbāna is realized by means of sotaapanna~nāna. Sotāpanna~nāna extinguishes kāma tanhā which can give rise to rebirth in the states of woe."
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Best wishes.