主要的义务规则是那些要求或禁止某些行为的规则。
Life is a journey, not a destination.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
The only way to survive is to take care of each other.
觉醒的人唯一的责任,是找到自我,成为自我,自己摸索前行的路。