The threefold path expresses the Zoroastrian conviction that ordinary moral life is participation in the great struggle of good and evil: to think, speak, and act well is to strengthen the good creation and hasten its final victory. Simple to state and demanding to keep, the maxim has made Zoroastrianism known for an ethic of active goodness rather than withdrawal, and it connects directly to the tradition's dualist cosmology and its hope of a renewed world. It remains the best-known summary of Zoroastrian moral teaching.
The maxim is given concrete ritual expression in the Navjote, or Sedreh Pushi, the initiation ceremony in which a Zoroastrian child, generally between the ages of seven and eleven, is formally invested with the sacred shirt (sudreh) and cord (kushti) and instructed for the first time in the obligations of the faith; the threefold formula of good thoughts, good words, and good deeds is central to the instruction given at this rite, making it, for most Zoroastrians, not merely an abstract doctrinal summary but the first ethical teaching formally impressed on a child entering full membership in the religious community. The formula rests on the oldest layer of Zoroastrian scripture: humata, hukhta, hvarshta, good thoughts, good words, good deeds, already appears in the Gathas, the hymns attributed directly to Zarathustra himself, distinct from and prior to its later ritual elaboration in the Younger Avesta and the Pahlavi commentary literature.