孔子曰：“益者三乐，损者三乐。乐节礼乐、乐道人之善、乐多贤友，益矣；乐骄乐、乐逸游、乐宴乐，损矣。”
【译文】 孔子说：“有益的爱好有三种，有害的爱好有三种。爱好礼乐、爱好称赞别人的优点，爱好广结善友，有益处；爱好放荡、爱好闲逛、爱好大吃大喝，有害处。”
The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
I think that the most important thing is to be kind to yourself and to others.
信念有创造的力量，也有毁灭的力量。
The measure of a man is what he does with power.
