The physical powers of the body cannot be separated from the rationale of the mind and the emotions of the heart. They are one and the same, a compilation of a singular being. It is in the harmony of these three--body, mind, and heart--that we find spirit.
Ultimately and inevitably, they fail. This I must believe. If the flame of the spirit's candle is extinguished, there is only death, and the tyrant finds no gain in a kingdom littered with corpses.
It is a resilient thing, this flame of spirit, indomitable and ever-striving. In some, at least, it will survive, to the tyrant's demise."...
Spirit. In every language in all the Realms, surface and Underdark, in every time and every place, the word has a ring of strength and determination. It is the hero's strength, the mother's resilience, and the poor man's armor. It cannot be broken, and it cannot be taken away.
This I must believe."
--Drizzt Do'Urden
from the book Exile by R.A. Salvatore (p255-6)