"Daena" ("din" in modern Persian and meaning "that which is seen") is representative of the sum of one's spiritual conscience and attributes, which through one's choice Asha is either strengthened or weakened in the Daena. Traditionally, the "manthras", spiritual prayer formulas, are believed to be of immense power and the vehicles of Asha and creation used to maintain good and fight evil. "Daena" should not be confused with the fundamental principle of "Asha", believed to be the cosmic order which governs and permeates all existence, and the concept of which governed the life of the ancient Indo-Iranians. For these, "asha" was the course of everything observable—the motion of the planets and astral bodies; the progression of the seasons; and the pattern of daily nomadic herdsman life, governed by regular metronomic events such as sunrise and sunset, and was strengthened through truth-telling and following the Threefold Path.