The Sufi, like a Zoroastrian or a Parsi, looks at the sun and bows before the air, fire, water, and earth, recognizing the immanence of God in His manifestation, taking the sun and moon as the signs of God. The Sufi interprets fire as the symbol of wisdom, and the sun as the celestial light. He not only bows before them but also absorbs their quality. As a rule in the presence of dervishes a wood fire and incense burn continually.