"Whether you are aware of it or not, everyone is controlling matter all the time.  Whether one wants to be a demonstrator or not he(she) is. It is impossible to not be a creator all the time. Everyone is creating every day.  We're not aware of it because we just don't look at it. Every thought, every single thought materializes in the physical world.  It's impossible to have a thought that will not materialize, except that we reverse it. If we say the opposite right after we have a thought with equal strength, we  just neutralize it. But any thought not reversed or neutralized, will materialize  in the future if not immediately. So this thing of demonstration that we're all trying so hard to do, we're doing all the time, unaware of the fact that we're doing it. All we need to do is to consciously direct it, and that we call demonstration.  Everything that everyone has in life is a demonstration. It couldn't come into your experience had you not had a thought it at some time prior. If you want to know what your sum total  thinkingness is, it's exactly determined by what's around you, what you have. That's your demonstration.