"According to Seneca, the Greek word euthymia is one we should think of often: it is the sense of our own path and how to stay on it without getting distracted by all the others that intersect it. In other words, it's not about beating the other guy. It's not about having more than the others. It's about being what you are, and being as good as possible at it, without succumbing to all the things that draw you away from it. It's about going where you set out to go. About accomplishing the most that you're capable of in what you choose. That's it. No more and no less. (By the way, euthymia means "tranquillity" in English.)"