No matter what happened and how angry you are, it is not wise to slam the door behind you, as you are very likely to return later. In the same way, never turn down others without leaving room for discussion, as you may need the same people some day.

Play your role as well as you can when you have the role, and behave as a great spectator when you do not have the role. You were born with nothing and everything you have gained later is net profit, so in bad time or good time, just enjoy your life accordingly.

There is nothing to complain about life, as you make what your life is, not life makes what you are. Save all the time spent on complaining, you can figure out several ways to improve your life.

It is smart of you to find shortcuts and finish things with less time and effort than others, but it is also nothing shameful if you have to take more steps than other to reach somewhere, as you thus have more experience than others about different things. Mistake to one purpose could be success to another purpose, so never allow frustration to beat you.

You decide on your own whether you are happy. When others are happy, it is kind of you to be happy for them, but do not forget to be happy for yourself, as your life is your own life and you deserve your own happiness.