In Zoroastrianism, water ("aban") and fire ("atar") are agents of ritual purity, and the associated purification ceremonies are considered the basis of ritual life. In Zoroastrian cosmogony, water and fire are respectively the second and last primordial elements to have been created, and scripture considers fire to have its origin in the waters. Both water and fire are considered life-sustaining, and both water and fire are represented within the precinct of a fire temple. Zoroastrians usually pray in the presence of some form of fire (which can be considered evident in any source of light), and the culminating rite of the principal act of worship constitutes a "strengthening of the waters". Fire is considered a medium through which spiritual insight and wisdom are gained, and water is considered the source of that wisdom. Both fire and water are also hypostasized as the Yazatas Atar and Anahita, which worship hymns and litanies dedicated to them.