[Unklejoe]

> feel joy when others are blessed, and feel pain when they suffer.

Most people will probably acknowledge that it's more complicated than that. I think it might have to do with how easily comparable the other person's life is to our own.

I can't explain it well, but here's an example:

I saw a video of a child surprising their step-dad with paperwork for the official name change (kid accepting the Dad's last name). The Dad cried out of joy.

The video made me feel good.

On the other hand, seeing someone that I graduated highschool with getting promoted and being more successful than me makes me jealous.

Why? Because he has something and I don't, but would be within the realm of possibility to achieve. This behavior can also be observed in monkeys, so I don't question it too much.