Lutheran theology is based on the teachings of Martin Luther, a 16th-century reformer who emphasized salvation through faith alone, grace, and the authority of Scripture. It asserts that humans are justified before God not by their own works, but by faith in Jesus Christ. This belief is central to the Augsburg Confession, a key document of the Lutheran Church. Another important aspect of Lutheran theology is the concept of the sacraments, particularly Baptism and the Lord's Supper. Lutherans believe these sacraments are means of grace, providing spiritual nourishment and strengthening faith. The emphasis on God's grace and the importance of community worship are also significant in Lutheran practice.