Christianity attaches importance to education. The contribution of early Christianity to education is to treat people from different social strata and ethnic backgrounds equally, and receive equal education for men and women alike. In the middle ages, education was mainly at the religious or political level, emphasizing the training of church leaders and clergy more than ordinary individuals; while the Renaissance, the focus was shifted from monks to secular people, but most of the upper social children and social elite. The Protestant Reformation in sixteenth Century also indirectly led to the development of universal education and primary, secondary and university school systems. Most of the well-known contemporary universities are related to the church. The first English motto of University of Oxford is "God is the light of the Lord", and the founder of Harvard University is also a priest.