The fravashi doctrine is one of the tradition's more unusual ideas. Every person has a fravashi, a pre-existent spiritual double that exists before birth and persists after death, and the Farvardin Yasht names the fravashis of the righteous dead in long lists. The striking element is a passage in which the fravashis are offered a choice: remain in the spiritual world in safety, or enter material bodies and fight in the world against the assault of the Evil Spirit — and they chose to come. Being alive is therefore, on this account, the consequence of a prior act of volunteering, which recasts embodiment as enlistment rather than fall or misfortune. Fravashis are held to fight alongside the living, to protect the household and the land, and to require remembering. The winged disc found on Achaemenid reliefs and used on virtually every modern Parsi institution as the faravahar is popularly identified with the fravashi, though scholars dispute what the Achaemenids meant by it.