Quotation from: The Gods of Mars

Written by: Edgar Rice Burroughs

Among the officers of the Xavarian I thought I could discern
division into factions ere we had reached Helium. There were those
who gathered about Carthoris and myself whenever the opportunity
presented, while about an equal number held aloof from us. They
offered us only the most courteous treatment, but were evidently
bound by their superstitious belief in the doctrine of Dor and Iss
and Korus. I could not blame them, for I knew how strong a hold
a creed, however ridiculous it may be, may gain upon an otherwise
intelligent people.