"One can fight and win a hundred wars if one knows both oneself and
the enemy." This is probably the most widely quoted concept from
Sunzi's Art of War.
The most effective strategies I think are "One can fight and win a
hundred wars if one knows both oneself and the enemy" and "The
army survives by threachery"(兵不厌诈).Because they not only include
the wisdom of war,but also reflect the color of philosophy.
"One can fight and win a hundred wars if one knows both oneself and
the enemy."It's one of the most widely used strategies and I think
it is much useful fou us to overcome difficulty in daily life.