Seventh-day Adventists believe that Ellen G. White, one of the church's co-founders, was a prophetess, understood today as an expression of the New Testament spiritual gift of prophecy. Seventh-day Adventist believe that White had the spiritual gift of prophecy, but that her writings are a lesser light to the Bible, which has ultimate authority. According to the 28 Fundamentals the core set of theological beliefs held by the Seventh-day Adventist Church, states that Adventists accept the Bible as their only creed and can be read online on the website of the Seventh-day Adventist Church.