Sun Tzu's quote

Sun Wu (simplified Chinese: 孙武; traditional Chinese: 孫武; pinyin: Sūn Wǔ), style name Changqing (長卿), better known as Sun Tzu or Sunzi (simplified Chinese: 孙子; traditional Chinese: 孫子; pinyin: Sūnzǐ; pronounced ), was an ancient Chinese military general, strategist and philosopher who is traditionally believed to be the author of The Art of War, an influential ancient Chinese book on military strategy. Sun Tzu has had a significant impact on Chinese and Asian history and culture, both as an author of The Art of War and through legend.

The supreme art of war is to subdue the enemy without fighting. The Art of War
If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle The Art of War, Special Edition
Appear weak when you are strong, and strong when you are weak. The Art of War
Victorious warriors win first and then go to war, while defeated warriors go to war first and then seek to win The Art of War
Supreme excellence consists of breaking the enemy's resistance without fighting. The Art of War
Keep your friends close, and your enemies closer
All warfare is based on deception. The Art of War
Opportunities multiply as they are seized.
Let your plans be dark and impenetrable as night, and when you move, fall like a thunderbolt.
A leader leads by example, not by force
When strong, avoid them. If of high morale, depress them. Seem humble to fill them with conceit. If at ease, exhaust them. If united, separate them. Attack their weaknesses. Emerge to their surprise.
Thus we may know that there are five essentials for victory: (1) He will win who knows when to fight and when not to fight. (2) He will win who knows how to handle both superior and inferior forces. (3) He will win whose army is animated by the same spirit throughout all its ranks. (4) He will win who, prepared himself, waits to take the enemy unprepared. (5) He will win who has military capacity and is not interfered with by the sovereign.
There is no instance of a country having benefited from prolonged warfare. The Art of War
He who knows when he can fight and when he cannot, will be victorious.