About 26 years ago, long before I knew much about empathy or understood what was happening to me, I made a set of runes out of wooden tiles. I had just gotten back from mexico were I learned how to make silver bracelets and rings with different stones. I used obsidian back then as a defensive measure against something I didn't understand. I studied astrology, numerology, mythology, the tarot, and feng shui. I made sigils on slate that I would hang over windows. I burned sage and incense. I carried a bone knife and warded my sanctuary. In spite of all my efforts, I can't say anything I did back then really protected me fully. It was weak magic. I was never going to get to the point of being John Constantine.
The most powerful tools we have is our imagination and intent. These objects I was using only had as much power as I gave them. The best thing I studied at a young age was creative visualization. I practiced making that image in my mind as clear as possible.
Satanist and others use sigils because they want power over others. I just want power over my life! Carrying stones and crystals has an effect. I see these as tools God gave us to use in order to get the point where we no longer need them. Kind of like getting over religion to get to true spirituality. Prayer has power over sigils, because our greatest power comes from outside us, not from within.
You've heard the phrase "The best defence, is a good offence'. That takes using more energy than we can create as humans. Using our own power drains our reserves and make us weak. True power comes from the Source of all power. This is power that you can channel to effect change and redirect your own power to help yourself. You have to be guided to do this. We don't instinctively know how to wield spiritual weapons. The spirit world works opposite our human nature. We have more understanding of it because of our sensitivity to the astral plane, but we have to go by hard rules. God's Law, which is Natural law, or Karmic law. The better you learn these rules, the closer you get to the Source. Runes can help guide you. God can use them just like he can use fortune cookies, or any other thing that we give the power to do so. Through our curiosity God beckons us to Him.