Hurting Others Must Bring Hurt to Ourselves
The words you think good do not necessarily give rise to the same feeling in others. And sometimes, frankness hurts. A straightforward and outspoken person may be warm-hearted and compassionate, but what he says may be difficult for others to accept. You can be frank, but try not to have a quick tongue. Think thrice before you act, and think over how others may feel. Hurting others must bring hurt to ourselves.

伤人必会伤己
自己认为的好话不一定就是好话，心直口快也很容易伤人。心直口快的人，可能是一个古道热肠的人，但是说出来的话，却让人不能接受。心可以直，口不能快，说话要三思而后行，要考虑别人的感受。伤人必会伤己。