120:3.7

“6. To the end that you may not unnecessarily contribute to the creation of subsequent stereotyped systems of Urantia religious beliefs or other types of nonprogressive religious loyalties, we advise you still further: Leave no writings behind you on the planet. Refrain from all writing upon permanent materials; enjoin your associates to make no images or other likenesses of yourself in the flesh. See that nothing potentially idolatrous is left on the planet at the time of your departure.