One who knows when to fight and when not to fight will be victorious

 

One who recognizes how to employ large and small numbers will be victorious

 

One whose upper and lower ranks have the same desires will be victorious

 

One who is full prepared, and awaits the unprepared will be victorious

 

One whose general is capable and not interfered with by the ruler will be victorious

 

Sun Tzu on Wikkipedia