The BEST episodes written by Girish Dhamija
#1 - Krishna's Lessons for Arjun
Mahabharat (2013) - Season 20 - Episode 12
Krishna helps clear Arjun's mind by telling him about sattva, tamas and rajas. He explains to him how the body can be destroyed but the soul remains eternal. He further explains how everyone has to eventually face death and that, he shouldn't worry about it but prepare for war.