Which is more important in human development of personality and intellegence: gene or environment?

In human body gene shows that he/she intelligent or dumb. However, it is not necessary always intelligent parents have a intelligent child. I think environment is important than gene to become intelligent. For example, if father and mother are not intelligent that doesn't mean their children will be stupid. Of course, they don't have intelligent gene. However, if they get good environment and they work hard, they can achieve success in any field. On the other hand, if somebody have intelligent gene but he/she doesn't get good environment. Maybe he/she will become stupid. In conclusion, environment is more important than gene to become intelligent because of this reason.