Episode 15 explores the third Niyama - Tapas which can be translated to self discipline or heat. 
In this episode Emily explains how the continuous spiritual effort or disapline changes the very nature of the self and personality to become someone of character and strength. Tapa's asks us to burn away our laziness and forsake momentary pleasures in order to create  future rewards and become the more evolved person we ultimately wish to be.

Recommended Reading:
The Yamas & Niyamas: Exploring Yoga's Ethical Practice - Deborah Adele

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