The grosser consciousness depends heavily on particles of matter. The subtler consciousness is more independent -- it does not depend so much on the brain. Luminance, radiance, imminence -- the three states of subtle mind -- all of these disappear in the clear Light, the innermost consciousness.
Human spirit is the ability to face the uncertainty of the future with curiosity and optimism. It is the belief that problems can be solved, differences resolved. It is a type of confidence, and it is fragile.