Pentecostals agree with the Protestant principle of "sola Scriptura". The Bible is the "all sufficient rule for faith and practice"; it is "fixed, finished, and objective revelation". Alongside this high regard for the authority of scripture is a belief that the gift of prophecy continues to operate within the Church. Pentecostal theologians Duffield and van Cleave described the gift of prophecy in the following manner: "Normally, in the operation of the gift of prophecy, the Spirit heavily anoints the believer to speak forth to the body not premeditated words, but words the Spirit supplies spontaneously in order to uplift and encourage, incite to faithful obedience and service, and to bring comfort and consolation."