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**Panak**
If someone possesses the Panak, then the essence of the Tirthankara nature is not found in all of their Gunasthanas.
The implication of this statement is that the Tirthankara nature is not found in the second and third Gunasthanas, and in the remaining Gunasthanas, it is possible for those who have bound it, but for those who have not bound it, it does not exist. Therefore, the essence of the Tirthankara nature is considered to be impermanent.
The reason why a bound Tirthankara nature can enter the Mithyatva Mrunastana is that if a being has previously bound itself to Naraka, and then attained Kshayopaashamak Samyaktv, and as a result of the fruits of the Sayas, has bound the Tirthankara nature, then at the end of its life, it vomits Samyaktv and attains the Mithyatva Gunastana, taking birth in Naraka. This is why it is said that a bound Tirthankara nature can attain the Mithyatva Gunastana.
Even if a being with the Tirthankara nature attains the Mithyatva Gunastana, it only stays there for a short time - Antamuhurta. The reason for this is that if a being has previously bound itself to Naraka, and later becomes a Vedak Samyagdristi and binds the Tirthankara nature, then when death approaches, the being becomes devoid of Samyaktv and becomes a Mithyadristi, and in the Mithyatva state, it takes birth in Naraka and becomes a Samyagdristi after Antamuhurta. This statement is based on the expectation of the Nikachit Tirthankara Karma. Because a being with the essence of the Nikachit Tirthankara Karma does not stay in the Mithyatva Gunastana for more than Antamuhurta, and after becoming sufficient, it immediately attains Samyaktv.