The still body helps by example to still the running of thoughts through the mind. By this continued practice the body-mind is made aware of its permanent self or soul or individualized spirit. In meditation the soul observes a constant hum of energy at first observed in the head. By deduction we analyze and find it is not part of the mind because the mind can have thoughts going on while the hum is still present in the background. This cosmic energy vibrates continually, upholding all creation.
Scientists can see that the movement within the atom is continuous.
The fine form of the cosmic hum is what sustains this atomic movement. In scripture this intelligent creative aspect of God, this cosmic hum, is known as 'The Holy Spirit', third person in the Trinity, the force creating and sustaining the manifest universe. Our individual soul observes the actions of our mind and mind-controlled body always. But the soul is never touched negatively by our thoughts or actions. Our soul observes as if from a grand stand, watching the parade of events go by.