It is the phenomenon of Gyges' ring.

I haven't heard of this, so I will have a look when I have a chance, thanks.

Only men, who have disciplined himself through mastering the rules imposed upon him from external sources and developed virtues within themselves, can live his life freely using the rules and virtues

I agree. it doesn't require group rules though as even people who live a hermits life conform to their own standardisation and playbook. Most likely to survive alone demands it.