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Nature certainly has an existence. It is also said that 'Sasaane Khalu Sammam Santan' - Samyaktva is a mohaniya (delusive) kriti (action) in the Sasadan gunasthan (state of being). The definite existence of both Mithyatva Mohaniya and Samyaktva Mohaniya has been stated. Thus, while stating the definite existence of Mithyatva Mohaniya and Samyaktva Mohaniya in the gunasthanas, the alternative existence of these two natures in the gunasthanas has been indicated by the terms 'Ajayaiaṭṭhage Bhajj' and 'Micchaaidasage Ya' respectively. This means that the nature of Mithyatva exists in the fourth Aviriti Samyagdristi and the other eight gunasthanas, while the nature of Samyaktva exists in the first ten gunasthanas, including Mithyatva, except for Sasadan. The reason for this is explained below.
The existence of Mithyatva nature in the first, second, and third gunasthanas is considered because Mithyatva exists in the Mithyatva gunasthan. During the time of Upshama Samyaktva, some beings attain the Sasadan gunasthan when at least one and at most six Avaliya periods remain. At that time, these beings certainly have the existence of both Mithyatva and Samyaktva nature. Therefore, along with stating the existence of Mithyatva in the second gunasthan, the existence of Samyaktva has also been stated.
"Uvasamasammattaao Chayao Miccham Apavamaanass. Saasayanasammattam Tayantarallammi Chaavaliy." - Visheo Bhaay 534. During the time of Upshama Samyaktva, when at most 6 Avaliya periods remain, the being, due to the arising of Anantanubandhi Kshaya, becomes detached from Upshama Samyaktva and until the being does not come into Mithyatva, it becomes Sasadan Samyagdristi for that period of time.