What is Kadi Vidya
Just as one does not feel hungry or thirsty in Hadi Vidya similarly in Kadi Vidya a person is not affected by change of seasons i.e. by summer, winter, rain etc. After accomplishing this Vidya a person shall not feel cold even if he sits in the snow laden mountains and shall not feel hot even if he sits in the fire. Thus a Sadhak can perform incessant penance without being affected by change of weather or seasons.
The Jain scholar, Pragya Sun had accomplished both the Hadi & Kadi Vldyas. Guru Gorakhnath and Matsayendranath too had accomplished them.
Today the Jain scholar of Mahabalipuram Sun Maharaj and Yogi Vishambhar of Badrinath are accomplished in these Vidyas and have kept these practices alive.