Those old Spanish conquerors had a monstrous greed for gold and a wonderful lust for saving souls. Treasures they must have, if not on earth, why, then, in heaven; and when they failed to find heathen temples bedecked with silver, they propitiated Heaven by seizing the heathen themselves. There is yet extant a copy of a record made by a heathen artist to express his conception of the demands of the conquerors. In one part of the picture we have a lake, and nearby stands a priest pouring water on the head of a native. On the other side, a poor Indian has a cord about his throat. Lines run from these two groups to a central figure, a man with beard and full Spanish panoply. The interpretation of the picture writing is this: Be baptized as this saved heathen, or be hanged as that damned heathen.
From: The Exploration of the Colorado River and Its Tributaries, by John Wesley Powell