The time of life is limited and unchangeable, so it is necessary to use every minute efficiently. Not using it well is a waste.
You have to fight to reach your dream. You have to sacrifice and work hard for it.
The choice for mankind lies between freedom and happiness and for the great bulk of mankind, happiness is better.
你必须先爱自己,别人才会爱你。
The only way to learn mathematics is to do mathematics.