The United Methodist Church understands itself to be part of the holy catholic (or universal) church and it recognizes the historic ecumenical creeds, the Apostle's Creed and the Nicene Creed; which are used frequently in services of worship. The Book of Discipline also recognizes the importance of the Chalcedonian Creed of the Council of Chalcedon. It upholds the concept of the "visible and invisible Church," meaning that all who are truly believers in every age belong to the holy Church invisible, while the United Methodist Church is a branch of the Church visible, to which all believers must be connected as it is the only institution wherein the Word of God is preached and the Sacraments are administered.