Just went through this with someone in the last week. You don't just let anyone who walks up to you lay hands on you. Nor do you do it to those you don't know, or to those you haven't been called to do this too. The Bible is there to give us direction on how things work, and we should use it. It's quite good :) if you take time and go through it. Nephtali gives us some good scriptural background in this video.
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