What might lead Kino and his brother to believe this? What might leadthem to be suspicious of the priest's sermon? chapter 4

Juan Thomas is a wise man. He knows the Pearl ignites the greed in the hearts of men. He realizes the pearl upsets the equilibrium of the village. Juan Tomas suspects the priest is in cahoots with the pearl buyers. His sermon basically tells Kino to know his place and sell for what the buyers ask.