What is Nam-myoho-renge-kyo ?

Before Nichiren Daishonin, T’ientai the Great teacher did established the theory to observe the Mystic Law. However, it was not a method for the people of the Latter Day. It was the Daishonin who realized from the “Mystic Law that all living beings originally possessed” hidden in the Life Span Chapter of the Lotus Sutra.
There was originally no name to call this “Mystic Law that all living beings originally possessed”. In order to establish the path to attain enlightenment for the people of the Latter Day, the Daishonin took an appropriate name that is Nam-myoho-renge-kyo, which is also the title of the Lotus Sutra, for this Mystic Law.
The Daishonin further declared that chanting Nam-myoho-renge-kyo is the practice for the people of the Latter Day to attain enlightenment. Nam-myoho-renge-kyo is the name of the law o the universe, which is also the name of the Buddha’s life, the name of all living beings. All the Buddhist gods were able to attain enlightenment basing on their realization of this Mystic Law.
In other words, the life of the universe, the life of a Buddha, and our life are three in one). If we chant and embrace Nam-myoho-renge-kyo, we will be in rhythm with the track of the universe. At the same time, we could tap our innate Buddha nature and manifest the boundless strength which we call the “power of the Mystic Law”.
There is meaning in every character of Nam-myoho-renge-kyo. Nam is devotion; that is, devoting our life. Myoho is Mystic Law; which means the law of the universe. Renge literally means the “lotus flower”, which has the meaning of simultaneity of cause and effect. Kyo means sutra or scriptures, including all sound and teachings of the Buddha.