It seemed to him that above the joyful cries of greeting he could hear the screams of agony of the victims, and to such a pitch was he wrought up that, had he seen any whom he could have recognized as priests, he would have fallen upon them with his sword.
But the priests held aloof from the gatherings.

They knew not, as yet, how their chiefs would regard this stranger, and it was not their policy to join in welcoming one who might, afterwards, be denounced and sacrificed as an enemy of their religion; nor, upon the other hand, would they commit themselves to hostility to one who might be held to be a god.
From the summits of the teocallis they looked down upon the great gatherings; angry that instead of, as usual, figuring in the chief places in the procession, they were forced to stand aloof.

As in Egypt, the Aztec priests embraced within their order all the science and learning of the nation.

They were skilled in the sciences of astrology and divination, and were divided into numerous ranks and classes.

Those best instructed in music took the management of the choirs, others arranged the festivals conformably to the calendar, some superintended the education of the young of both sexes, others had charge of the hieroglyphic paintings and records and of the oral traditions, while the rites of sacrifice were practiced by the chief dignitaries of the order.