Sanatana Dharma

My Understanding: Vedanta teaches you to walk on the path of dharma to understand Sanatana (eternal) and it's a completely spiritual path to attain nirvana. But those who just want the actual experience prefer to follow an enlightened spiritual guru instead of going into all these spiritual theories. Theories may help in understanding the concept intellectually but they can also be a hindrance in the actual experience. So, not necessary at all unless you want to be a scholar. 

Basic Intro:

Detailed explanation: