Almost exhausted or nearly depleted; practically nothing left.

To come unscathed through a hundred battles; to win every fight (idiom from Sunzi's "The Art of War").

in a life-threatening or precarious medical condition

knowing the enemy and yourself will get you unscathed through a hundred battles (idiom, from Sunzi's "The Art of War")

To learn without thinking is confusing, to think without learning is dangerous (Confucius)

know yourself and know your enemy, and you will never be defeated

to be completely used up, lost, or exhausted; to vanish or disappear entirely