However critical the situation and circumstances in which you find yourself, despair of nothing; it is on the occasions in which everything is to be feared that it is necessary to fear nothing; it is when one is surrounded by all the dangers that it is not necessary to dread any; it is when one is without resources that it is necessary to count on all of them; it is when one is surprised that it is necessary to surprise the enemy himself.

Sun Tzu, The Art of War