To maintain mental clarity without any psychic garbage entering in, envision a blue light emanating from your third eye up towards the heavens. This will create a communion with the Spirit and will protect your mind from darkness. I spent too much time in my young life trying to filter darkness from light to the point where I thought I had to completely close the third eye, but, when I did this I also blocked my inner sight, which leads you directly to inspired wisdom. There was always a war on inside my mind. Then an amazing healing woman helped me with my desperate struggle by showing this powerful, positive technique. It really works. Give it a try.