Equiano makes numerous references to the similarity between the Jews and his people. Like the Jews, not only did his people practice circumcision, but they also practiced sacrificing, burnt offerings, and purification. He explains how Abraham's wife was African, and that the skin colour of Eboan Africans and modern Jews differs due to the climate. At the end of the first chapter, Equiano asserts that Africans were not inferior people; the Europeans considered them as such because they were ignorant of the European language, history, and customs. He explains it is important to remember the ancestors of the Europeans were once uncivilized and barbarians. He states, "Understanding is not confined to feature or colour."