" Not only during the ascent, but also during the descent my willpower is dulled. The longer I climb the less important the goal
seems to me, the more indifferent I become to myself. My attention
has diminished, my memory is weakened. My mental fatigue is now
greater than the bodily. It is so pleasant to sit doing nothing - and therefore so dangerous. Death through exhaustion is like death
through freezing - a pleasant one. "

― Reinhold Messner , Crystal Horizon: Everest: The First Solo Ascent