When you inquire 'Who am I?' if you are honest, you'll notice that it takes you right back to silence instantly. The brain doesn't have an answer, so all of a sudden there is silence.
In silence a question has great power, because in silence a question will always lead you deeper into your experience. If there is no grounding in silence, a spiritual question is going to lead you into your mind.
Bring your mind to noble silence. Unify your mind in noble silence. Concentrate your mind in noble silence... Enter into rapture and pleasure born of silence derived of concentration and awareness that is free from thought and fabrication.