Hi Wind,
Govern: to direct the public business of a country, city, group of people, etc.
Control: to order, limit or rule something, or someone's actions or behaviour. It addresses more on "rule over something, or someone"
You're going to have to learn to control your temper.
The temperature is controlled by a thermostat.
The laws controlling drugs are very strict in this country.
Our mental attitude could govern our happiness. There is a meaning of "direct" or "guidance" here, while control doesn't have the "guidance" meaning.