Morality emerges out of iterative voluntary games. What we regard as moral is the principle that most aptly governs the longest game.

It's an idea Peterson borrowed from Jean Piaget, a Swiss psychologist. Piaget focused on kids as ways to understand humanity at large. He believed that the act of voluntary play in kids is the precursor to ethical societies. The games are thus micro-cosmoses of society and as we grow up we are just extending the game into adulthood.

If 2 groups are playing a game: one group playing the game voluntarily and another one forced to do so .... The voluntary group will always outperform the other. 

Fiat, ruling through power, is demonstrably a sub-optimal strategy compared to freedom. This idea has implications in: