They will teach us to quarrel about God, as Catholics and Protestants do on the Nez Percé Reservation [in Idaho] and at other places. We do not want to do that. We may quarrel with men sometimes about things on earth, but we never quarrel about the Great Spirit. We do not want to learn that.

Chief Josephj
Chief Joseph (1840-1904) Leader of the Wallowa band of the Nez Percé [Hin-mah-too-yah-lat-kekt, Hinmatóowyalahtq̓it]
Statement (1873-03-27) to T. B. Odeneal
    (Source)

When asked by US government commissioners about allowing schools and Christian churches on a proposed Wallowa Valley Nez Percé reservation.

A slightly shorter version of this quotation is prominently displayed at the visitors center of the Crazy Horse Monument, South Dakota.