English translation
Sun Tzu said: In the methods of warfare, a commander takes orders from the sovereign, unites the forces and gathers the troops. On broken ground do not linger; at crossroads join with allies; on cut-off ground do not remain; when surrounded, devise plans; on fatal ground, fight. There are roads one must not take, armies one must not attack, cities one must not besiege, terrain one must not contest, and sovereign commands one must not accept. Therefore a general who understands how to exploit the advantages of the Nine Changes knows how to employ troops; a general who does not understand the advantages of the Nine Changes, though he knows the lay of the land, cannot gain its benefits; one who organizes troops without knowledge of the Nine Changes, though he knows the terrain's advantages, cannot make effective use of his men.
Chinese source
孫子曰：凡用兵之法，將受命於君，合軍聚眾。圮地無舍，衢地合交，絕地無留，圍地則謀，死地則戰。途有所不由，軍有所不擊，城有所不攻，地有所不爭，君命有所不受。故將通於九變之利者，知用兵矣；將不通於九變之利，雖知地形，不能得地之利矣；治兵不知九變之術，雖知地利，不能得人之用矣。
Therefore the wise man's deliberations always mix considerations of benefit and harm: mixed with benefit he attends to what is attainable; mixed with harm he seeks dangers that can be resolved. Thus one bends the feudal lords by pointing to harms, conscripts them by appealing to obligations, and draws them forward by offering benefits.
Chinese source
是故智者之慮，必雜於利害，雜於利而務可信也，雜於害而患可解也。是故屈諸侯者以害，役諸侯者以業，趨諸侯者以利。
Hence in the art of war do not rely on the enemy not coming; rely on being prepared to meet him. Do not rely on him not attacking; rely on possessing positions or conditions that cannot be successfully attacked.
Chinese source
故用兵之法，無恃其不來，恃吾有以待之；無恃其不攻，恃吾有所不可攻也。
Therefore a general has five dangers: one who resigns himself to death can be slain; one who clings to life can be captured; one quick to anger can be despised; one overly punctilious in integrity can be humiliated; one too fond of his people can become burdened. These five are a commander's faults and the disasters of employing troops. When an army is overturned and a general killed, it is always because of one of these five dangers; they must not be neglected.
Chinese source
故將有五危︰必死，可殺也﹔必生，可虜也﹔忿速，可侮也﹔廉潔，可辱也﹔愛民，可煩也。凡此五者，將之過也，用兵之災也。覆軍殺將，必以五危，不可不察也。