"A History of Quakerism" in 3 volumes is a book by the English abolitionist Thomas Clarkson that features all the most important aspects of the Quakers' life, such as education and discipline, social manners, civil and political economy, religious principles and character of their religious organization. Quakers are a historically Christian denomination whose formal name is the "Religious Society of Friends" or "Friends Church". Members of the various Quaker movements are all generally united by their belief in the ability of each human being to experientially access the light within, or "that of God in every one".