Historians label an event as a turning point when it causes a change that was not anticipated and that has deep repercussions in future events. A turning point is a moment in history in which a particular act alters the future in a significant, unpredictable way. For example, the publication of the Ninety-Five Theses by Martin Luther is considered a turning point in history because this single act significantly weakened the most powerful entity in the world (the Catholic Church) in a way that was not anticipated. Moreover, the consequences of this act in the form of the Reformation were enormous.