There are many explanations to the complexity of the mantra. Purportedly saying the word produces an actual physical vibration. If the meanings behind the words are strong meant to come to pass then the vibration takes on a level of significance to bring energy to the words.
Thus the coupling of the spoken word and the mental influence plays a part in creating the “power” that carries the intent into significance. The general understanding is that there is power in the word but this power is released or magnified only when actually verbalized.
In exploring deeper into the mantra, further connections can be made to the human consciousness. The human body consists of various organs which have specific functions but have to work as one entity, in order to facilitate optimum existence. This system is overlaid by several states of consciousness which can be evident through the subconscious mind at any given time.