Rule Four: Conformity is the Norm
You become your environment. Uniqueness and individuality tend to warp to fit the people around you. This is true of other people as it is for yourself. It means you should be careful who you pick as friends, partners and colleagues.
This is why I believe it is important to keep a varied social group. When you interact with people from completely different backgrounds, beliefs and behaviors on a regular basis you are more likely to see different perspectives. This also means you have more control in picking who you want to be.