What is the "SOUL?" The soul emboddies the internal and spiritual aspect of all persons. The soul is, in essence, an immaterial spirit that creates the self through life-activating force. A soul can feel and eminate emotions on a deep and spiritual level.
In 1854, a physiologist by the name of Rudolf Wagner wrote a hypothesis on "Special Soul Substance." His belief was that the soul harbored weight; as when the bodily form passed, the postmortem weight was and is, (by all accounts), evidentually less. This being further support of the soul's existence.
The soul is somewhat comparable to that of a flickering flame atop a candle. You can feel its warmth, see its radiance; but although constant, it is everchanging, ever-evolving. Similar to that of our own bodily forms, the candle is merely a vessel. Without the flame, the candle has no "life." So, metaphorically speaking, our souls are flickering candles in the wind.