Excellent message by JD Ellis at Endtime Delusion,
In some Christian circles today it seems that the only authority needed to be a prophet of God is your own desire to be one. You just proclaim yourself a prophet, start a website with a prophetic-sounding name, and begin issuing messages said to be from God. Claims are made by the modern day prophets that God favors them with prophetic ability because they are “close” to the Lord, and have cleaned up the sin in their lives. Their repentance, along with spending a great deal of time in their prayer closets, has, according to them, opened up a special conduit of communication in which God reveals the future to them, and endorses them as His special messengers. Thus, in contrast to the teaching of Paul in the New Testament on salvation, which comes through grace alone and not through works, it seems that the prophets believe their prophetic gifting comes through their works.
By studious effort, and lifting themselves up by the bootstraps, they have elevated themselves to the post of God’s chosen prophet. They seem to not know, or not care, that they are speaking for God without the authority to do so. Thus the term “self-appointed prophet” is actually very accurate, since the prophet confers the office of prophecy upon himself… (more at link)