This is a study of an ideological conflict within the Presbyterian Church of New Zealand. It is about a controversy which stimulated fiercer debate than the church had seen in its previous sixty years of united existence. It concerns a conflict which at some stage encompassed most of the fundamental doctrines of the organization and involved the participation of nearly all its leading figures. The central personality of the whole debate was Lloyd Geering, principal of the denominational seminary, who found himself at the end of 1967 arraigned before the highest court of his church on a charge of heresy.