are known to have used prayer sticks, that is, sticks with feathers attached as supplicatory offerings. The Hopi Indians used prayer sticks as well, but they attached to it a small bag of sacred meal. Approaches to prayer Direct petitions There are different forms of prayer. One of them is to directly appeal to a deity to grant one's requests. Some have termed this as the social approach to prayer. Atheist arguments against prayer are mostly directed against petitionary prayer in particular. Daniel Dennett argued that petitionary prayer might have the undesirable psychological effect of relieving a person of the need to take active measures. This potential drawback manifests in extreme forms in such cases as Christian Scientists who rely on prayers instead of seeking medical treatment for family members for easily curable conditions which later result in death. Christopher Hitchens (2012) argued that praying to a god which is omnipotent and all-knowing would be presumptuous. For example, he interprets Ambrose Bierce's definition of prayer by stating that "the man who prays is the one who thinks that god has arranged matters all wrong, but who also thinks that he can instruct god how to put them right." Educational approach In this view, prayer is not a conversation. Rather, it is meant to inculcate certain attitudes in the one who prays, but not to influence. Among Jews, this has been the approach of Rabbenu Bachya, Rabbi Yehuda Halevi, Joseph Albo, Samson Raphael Hirsch, and Joseph B. Soloveitchik. This view is expressed by Rabbi Nosson Scherman in the overview to the Artscroll Siddur (p. XIII). Among Christian theologians, E.M. Bounds stated the educational purpose of prayer in every chapter of his book, The Necessity of Prayer. Prayer books such as the Book of Common Prayer are both a result of this approach and an exhortation to keep it. Rationalist approach In this view, the ultimate goal of prayer is to help train a person to focus on divinity through philosophy and intellectual contemplation (meditation). This approach was taken by the Jewish scholar and philosopher Maimonides and the other medieval rationalists. It became popular in Jewish, Christian, and Islamic intellectual circles, but never became the most popular understanding of prayer among the laity in any of these faiths. In all three of these faiths today, a significant minority of people still hold to this approach. Experiential approach In this approach, the purpose