Give me some great quotes about surviving in the wild.

Some memorable quotes about survival include: 
"If you live among wolves you have to act like a wolf." - Nikita Khrushchev;
"I went to the woods because I wished to live deliberately… and see if I could not learn what it had to teach.” - Henry David Thoreau:
"Hunger, love, pain, fear are some of those inner forces which rule the individual’s instinct for self-preservation.” - Albert Einstein;
"Extraordinary people survive under the most terrible circumstances and they become more extraordinary because of it.” - Robertson Davies;
"If quick, I survive. If not quick, I am lost. This is ‘death.'" - Sun Tzu and;
"Courage is not having the strength to go on; it is going on when you don’t have the strength.” - Theodore Roosevelt.