In a religion as ancient as ours, the center of our spiritual physical being lies with these very priests. The dasturs, as they are known, are the custodians and implementers of all matters pertaining to religion, customs, ceremonies and the overall conscience of the religion. Zarathusti priests have over the centuries been the guiding force in the interpretation of our ancient texts, performing ceremonies of happiness and sadness, and being the silent custodians and arbitrators of our religious ethos.
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http://nextgennow.wordpress.com/2009/10/09/religious-education-and-the-future-of-young-mobeds-in-north-america-and-beyond/