《淮南子·兵略训》
将帅如能做到上述这些，也就叫达到了深远奥妙的境界，有谁能知道他的真情！
是谓至于窈窈冥冥，孰知其情！
If a general can do all of the above, then he or she has reached an extremely profound and mysterious realm. Who can know their true feelings!