Be careful with the things you do and say to other people because karma is just around the corner.  Never do something bad to another person because it might return to you just as soon as you did it.  And sometimes, the impact is double or a lot more than what you did.

Always be fair.  Even if somebody did something bad to you, just leave it to God.  Dont fight back or revenge.  God is fair and knows everything.  so you dont have to put it in your hands.  God knows just what to do.