The yogi is a scientist of the inner. All that he knows is based on experiment, experience, and evidence. If you are thirsty you do not need the description of water :D You need real water to taste it and to experience it. We had a talk about religion, about how yoga is not a religion. About God, or call the cosmic consciousness. We know everything is moving in order, and the intelligence is behind is what we call God, in Sanskrit Ishvara.
***** The only mistake you can do in your life, you do live your life without consciousness.*****