My mind is not a physical thing, although science would have me believe that my mind is contained within my head, a non-physical thing cannot be contained in any specific place.
A circle is an infinite loop because it keeps asking it self questions.
True clarity is a limited product of light, and darkness induces lies and confusion. My eyes can see and process light, while my mind rambles with unlimited imagination. I can see a painting of a beautiful woman, and it's true, but to ask myself who painted it, when, and why, then I start telling myself lies, in darkness.
I am the only person that I know for sure does exist as my mind is the only mind I know to be true.