Optimism tricks you into trying more things: If you believe success is almost guaranteed, you’re going to try some pretty fun ventures. In reality, sure, you fail at some things, but what do they always tell us is the best teacher? That’s right, it’s failure. So you end up racking up much more hard-earned experience and knowledge than the non-optimist. Then what do you do with all that extra knowledge? You succeed. Meanwhile, everyone else is still hesitating to try the first thing.