There is a big difference between God Himself healing someone through prayer (which He did throughout history) and God giving a person a gift to be able to heal someone by laying their hands on them. There is a big difference between man being able to receive wisdom and knowledge through studying the Word of God and in answer to prayer (which again has happened in both the OT and the NT), and someone having a gift of wisdom or knowledge - which would seem to be wisdom and knowledge apart from the Word of God. The same goes with discerning of spirits - there is discerment based on the Word of God, available to every single believer (and referred to in various places in the Bible), and some kind of spiritual discernment given by the Holy Spirit apart from the Word of God.