Writing or speaking of the spirit is certainly not easy, especially since the term spirit does not say anything if we refer to an alleged...ghost! Actually we are a spirit of the body. This is the basic reflection from which this book Springs; on the one hand, our self relies almost exclusively on sight as visionary knowledge and perception of our material world. On the other hand, our " i " who feels the actual presence of a spiritual space that surrounds things and is present within matter. All thinking creatures belong to it, willingly or unwillingly, and the complex perception of these two sensory States is entrusted to our spirit. The soul is not another person but it is we who even perceive all the physical sensations received by the brain, a true catalyst of energy. As our spirit sees beyond our eyes, perception occurs simultaneously on two fronts: external vision and internal vision. On the one hand the provisional reality that is the physical one with a time and various artificial spaces, on the other the definitive reality without time and with a single space that absorbs the whole matter. Our rationality, or Enlightenment reason, is exclusively linked to language, an arbitrary code, so at the moment of the birth of man, perception is pure: seeing and hearing without understanding. In adulthood, this stage of special serenity can be achieved only with prayer. Thought is here called an inner image. while subjectivism and objectivism are only related to language or mathematical numbers, they do not constitute a guarantee of absolute certainty and, above all, of true freedom.