Foreign spirits are entering churches and ministries undetected. Prophetic people are first targets of these deceiving spirits. Prophesy, for example, is not something done by faith alone. Accuracy requires unction from the Holy Ghost. Faith alone will not force the Holy Spirit to speak. Yes there is a measure of faith involved but the prophet does not make prophetic utterances come by faith. The seasoned prophet understands this and is able to protect himself and others from prophetic error and foreign spirits.