Enthusiasm versus the Scriptures

In our day, the largest portion of evangelicalism consists of pentecostal denominations and charismatics within non-pentecostal denominations. Such groups are marked by their claims of miraculous gifts of unknown languages, prophecies, healings, etc.  I have explained before why I do not consider such "gifts" to be legitimate expressions of the Holy Spirit, such as here. Not only do I consider the original gifts to have ceased, but I do not believe that their modern forms are even like the biblical gifts.

One major concern I have with such claims is that people receive revelations from God. Especially in Africa and South America, so-called "evangelists" claim that God has given them messages, whether for the crowds they attract or for individuals. Sometimes they claim that such revelations are of less authority than Scripture; other times they don't. Theologian Wayne Grudem even claims that modern prophecy is fallible, while biblical prophecy was infallible. How can a revelation from God be fallible? And how can one revelation from God be less revelatory than another? These are distinctions without differences!

Furthermore, what happens when a "revelation" contradicts Scripture? That would be true of all of the revelations claimed by Mormonism. Yet, even a single isolated revelation would be the word of God! It would be from the same source as Scripture. Therefore, to claim that it has less authority is irrational.

This is why I don't just refuse to seek such revelations for myself, but I am forced to deny the biblical faith of those who claim such revelations. Either they are lying or they are under the influence of lying spirits. Either way, such claims are inconsistent with a sincere profession of faith, which must, necessarily, include receiving the Bible as the inerrant and all-sufficient word of God.

The Prophet Isaiah dealt with such men - let's call them by the term used by the Puritans, Enthusiasts - who claimed revelations from various methods of divination, including necromancy. Here was the answer that God gave such men through His real prophet: "When they say to you, 'Inquire of the mediums and the necromancers who chirp and mutter,' should not a people inquire of their God? Should they inquire of the dead on behalf of the living? To the teaching and to the testimony! If they will not speak according to this word, it is because they have no dawn" (Isaiah 8:19-20). Point them to the Scriptures! If their revelation agrees with them, then those revelations are unnecessary. If they conflict with the Scriptures, then those revelations are lies. 

"A deep conviction of the fullness and sufficiency of the Scriptures, combined with a hearty regard for their disclosures, is the only effectual check to this [inquisitive and speculative] presumptuous pride of intellect" (James Henley Thornwell, "Election and Reprobation").