How the Mantra Works..?

SIX PARTS OF A MANTRA
A mantra has the following six parts:
1. It has a Rishi who had self-realisation for the first time through that mantra, and who gave that mantra to the world. He is the seer for that mantra. For example, Sage Vishwamitra is the Rishi for the Gayatri mantra.
2. The mantra has a Metre, which governs the inflection of the voice.
3. The mantra has a particular Devata or supernatural being, higher or lower, as its informing power. This Devata is the presiding deity of the mantra.
4. The mantra has a Bija or seed. The seed is a significant word, or series of words, which gives a special power to the mantra. The Bija is the essence of the mantra.
5. Every mantra has a Shakti. The shakti is the energy of the form of the mantra, that is, of the vibration forms set up by its sounds. These carry the individual to the Devata that is worshipped.
6. The mantra has a Kilaka, pillar or pin. This plugs the mantra chaitanya, consciousness, that is hidden in the mantra. As soon as the plug is removed by constant and prolonged repetition of the name, the Chaitanya  or consciousness that is hidden is revealed.
Then the devotee gets darshan of the Ishta Devata.