For us, it is the realisation that it is both of us - as a team - against the world. IE put less energy into quarrelling with each other, and more into making t

For us, it is the realisation that it is both of us - as a team - against the world. IE put less energy into quarrelling with each other, and more into making the team more capable/efficient/whatever-the-goal-is. But not everyone is so confident in the partner to assume they see themselves as an equal in partnership.