Pages of Devatma Shakti 132 is an incredible and perfect description of 3 gunas, ardhendu, naad, shakti and par shiv.
This description is better than a generic description given by Paramhansa Yogananda. What Yogananda Maharaj wrote was designed to be read by many people, and masses cannot comprehend the stages of samadhi.
These things are mere words or imagination for most. Yet, an adept yogi can decipher it immediately based on inner experience. The words are not as simplistic as the intellect or thoughts understand but a description of pure experience.
At that level, all words and understanding lose meaning. What more can I say?
Bhavin