"Have more than you show, speak less than you know."
Simple words but have great meanings. Don't be an arrogant person because of something that you have. I believe there are sky above the sky. There are many people who have more than you. The most important thing is don't ever show something which is not your achievements, for example : your parents wealth, or your friends stuff. That's nasty and people will throw bad respect on you. Related with things and stuffs, words also can be a boomerang. Keep silent when you don't know anything. Never speak something that you don't know completely. Cause it might be a turning point for people against your words.
Conclusion : "Keep low profile." :)
Notes : I won't make Indonesian version, because i couldn't find the right words that have the same meaning.