The most valuable skill you can develop is staying in a good mood for no reason at all. Society accepts bad moods as inevitable, but choosing to feel good anyway gives you a real edge. It's a habit that serves you rather than just reflecting what's happening around you.
The single greatest skill that you can develop is being in a great mood in the absence of things to be in a great mood about. Most people don't question someone who's in a bad mood. Like, I'm just in a bad mood. So it's like, well, if you can be in a bad mood for no reason, it's like you might as well be in a good mood for no reason, because that one at least serves you.
