Heat and cold may kill us. Storms can destroy our belongings. Cliffs and precipices threaten our safety. Sensual pleasures eat away at our minds.

• 烈日严寒可以夺走人的生命风暴流沙可以淹没人的身体悬悬峭壁可以摧毁人的前途声色货利可以腐蚀人的心志。