You are commanding when you speak. When we speak we automatically give command to heaven and/or hell (Hell is a place that is separated from the presence of the Omni-Present God). Hell is governed by angels that live out alignment (agreement) with God.
I have been exercising my command to go straight to the heavens. It makes sense to me now, how easy it is to have hell bound thoughts. Not that you purposely want hellish things in your life, but not understanding what your really causing to manifest when you do not keep a positive, uplifting thinking paterning can be very dangerous to the manifestation in the physical.
Yes this has been tried and proven not just by those who are here today but those who have gone before us. The people we read about in the bible are real!