臣民对主权的义务，只要主权者能保护他们，就持续存在，否则就不再存在。
The obligation of subjects to the sovereign is understood to last as long, and no longer, than the power lasteth by which he is able to protect them.
学习数学的最好方法就是去做数学。
"The truth is rarely pure and never simple."
The more you are in a state of gratitude, the more you will attract things to be grateful for.
真正的进步不仅仅以利润来衡量，还以我们对社会的积极影响来衡量。