... I analyze here the subtle bodies of man, namely all those structures normally "invisible" of which we are made, and which continuously interact with our physical body. Some of these structures are mortal and match the physical body to allow its existence. Others, however, go beyond the limits of space and time and have a sort of "immortality": they are our true essence and continuity over time. Submitting our subtle bodies in an organized and systematic way, I try to make understandable to the rational mind also those aspects that go beyond it and that normally are incomprehensible.