Dopamine, Oxytocin, and Serotonin Reward a Mammal for Being Strong

There is a selfish urge to have social support and being giving an altruistic may help you get support. Your brain rewards you with serotonin when you feel special. And it's hard to deal with the fact that 8 billion other people in the world want to be special as much as you do. So one of the messages there is kind of to recognize our own selfish desires at play.