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Karma, according to its nature, varies. Sometimes it passes naturally in its uninterrupted course, and sometimes, due to the combination of a particular cause and a particular potency, it also becomes exhausted. The completion of this uninterrupted course of karma is called 'Apvarthanakaran'.
Just as the state and essence of karmas bound by a particular potency can be reduced, similarly, karma can be transformed from its own nature into its homologous nature by a particular potency. This transformation of karma into its own homologous karmic nature by a particular potency is called 'Samkranti'.
The original natures of karmas do not transform into each other. However, the sub-divisions of the original karma can transform, or they may not. For example, 'Jnanaavaranakarma' is the original karmic nature, and 'Matijnanaavaran', 'Shrutajnanaavaran', etc. are its sub-natures. Among these, 'Matijnanaavaran' karma can transform into 'Shrutajnanaavaran' karma, or 'Shrutajnanaavaran' karma can transform into 'Matijnanaavaran', etc. This is because these natures are homologous to each other, being sub-divisions of the original karma 'Jnanaavaran', and they only cover knowledge, but they do not have the capacity to cover other qualities of the soul.
In other words, 'Jnanaavaran' does not transform into 'Darshanavaran', and 'Darshanavaran' does not transform into 'Jnanaavaran' karma. This is because these two karmas have different natures and they have the capacity to perform different functions. They can only function according to their own nature, but they do not have the power to abandon their original nature. If the original natures of karmas were to abandon their original nature, then the entire karmic system would be disrupted.