我们必须学会全面地看问题，不但要看到事务的正面，也要看到它的反面。在一定的条件下，坏的东西可以引出好的结果，好的东西也可以引出坏的结果。——毛泽东
We must learn to look at problems all-sidedly, seeing the reverse as well as the obverse side of things. In given conditions, a bad thing can lead to good results and a good thing to bad results. —— Mao Tse-tung
