Agreed on the third dimension of human existence: the physical, the mental and the spiritual. The first two exist in the natural universe, but the third seems to exist as part of the supernatural AKA outside the natural universe.
Many people, including both the CIA and KGB, have tried to connect with supernatural forces, specifically ESP and telekinesis, but all have failed. There is no physical proof if the existence of the supernatural. It's a matter of belief and faith as you pointed out.
of or relating to an order of existence beyond the visible observable universe; especially : of or relating to God or a god, demigod, spirit, or devil; departing from what is usual or normal especially so as to appear to transcend the laws of nature… See the full definition
www.merriam-webster.com
1: of or relating to an order of existence beyond the visible observable universe
especially : of or relating to God or a god, demigod, spirit, or devil