Know Astrology to know why we or another is the way we or they are.
Know Karma to understand why we are experiencing the phases we are currently going through.
Know Yoga to know the Prana within (Sakti).
Finally, when the Kundalini brings us to connect with the Prapanjam, awareness of the soul, or JeevAtma, shall dawn, and we shall know "thyself", and its oneness with Yegan, ParamAtma, or Sivam.
In knowing these, we have walked the four phases of Sariyai, Kriyai, Yogam, and Gnanam.
The Siddhas and the gurus in physical form who have been there come to show us the way, the means, and methods towards arriving there, or rather dismantle us and remove the veil that has covered the intelligence that resides within us, bringing on enlightenment.
Above and beyond knowing and understanding, one has to adopt and practice what is given or told to see its results. The Siddhas and gurus shall give a hand in difficult times, when energy stagnates, or obstacles and hindrances surface.
So too should one then pass on these messages and practice to others, too. In doing so, our purpose here comes to an end.