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Samadhitantram
major transformations or changes in our body, which truly are results of minute changes taking place every instant, we term these changes as due to 'aging'. The substance of time, which itself is without activity, is the auxiliary cause of the minute changes taking place in all substances. Conventionally, however, we talk of time as the past, the present and the future, or years, days and hours. Changes, minute as well as perceptible, must take place in our body and this process cannot be subverted. The body must undergo transformations due to the substance of time. And on the completion of the age-karma the soul must depart from the body to its new abode. Our efforts to nourish the body at the expense of the soul, therefore, are short-sighted and are bound to result into suffering.
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Excerpted from: Jain, Vijay K. (2014), "Acārya Pujyapāda's Iṣṭopadeśa", Vikalp Printers, p. 58-60.