An excerpt from The Mind: Its Projections and Multiple Facets by Yogi Bhajan (page 101)
Sadhana. That is where you sit, dwell in the thoughts and words of the soul, and peel away all your non-reality with the vastness of your spirit. If you train your mind this way, then you will discover something for yourself. If you live in absolute fearlessness, God will live in you because fear and truth cannot go together.