BHAGAVAD GITA
The only book that piqued my Interest
As well as taught me the way of life
As I understand it, the supreme soul means the fully enlightened soul, which has the knowledge of all those things which can reveal your hidden knowledge of beings by removing the darkness of anger, lust, love, impact and such things that binds us to this mortal world. Krishna is said to be the enlightened soul, because he had that knowledge to recognize truth, Dharma, who can guide to the right path. And his soul can be said as the supreme soul. Gita has 18 parts (Adhyayas), and among all these, there are four parts which I think we all must understand deeply. Among those all parts, I consider Sankhya Yoga, Karma Yoga, Karma Sanyas Yoga and Bhakti Yoga as the best to understand. And then few others are Gyan-Vigyan Yoga, Vibhuti Yoga and Gyan Yoga which would explain you the existence of materials and each thing in the universe.
Learn more on wikipediaMade By Devagya Singh