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I personally believe that the mark is not a device or visible tattoo or such. Using the symbolic nature of the Bible, and traditions of mankind, we know that people have used bands on their wrists and marks on their forehead to signify following a cause. In this case, I think we are dealing with thoughts and actions. God expects us to put him first and follow him with all our mind and heart. Also we are to work in his ministry using hands-on. So the mark is not only something God can see, Our thoughts, but those that man can see, our actions.