With each and every breath, the Soham mantra vibrates within the sushumna, the central nerve that runs from the root chakra at the base of the spine to the crown chakra at the top of the head. This mantra is the spontaneous vibration of God resonating within the human form; it is not produced by the sound of your voice or your mind. This divine vibration within your being opens the gate at the base of the spine and at the crown of the head so that the light of infinite consciousness can flow in; when this happens, the vibration of the Soham goes higher and higher, raising your attention.
This is a profound mystery, and it is the way of awakening. In this way you will make the journey from the lower depths, where you have taken false refuge in confusion and ignorance, obsessed with the belief in your individual identity, to higher and higher frequencies of connection with God. In the end, your attachment to a personal identity will dissolve, and you will surrender the identity of your individual nature completely, merging with the universal nature of God.