It’s October 10th, and it’s a great day to celebrate. It’s World Mental Health Day, a day we, the people of the world, say to ourselves and to each other that mental health is important. Thanks to so many organizations (there’s a partial list and links at the end of this article), people are increasingly talking about mental illness and mental health and are realizing just how important it is to take care of mental health. What, though, does mental health really mean? We know that it has to do with the brain and with thoughts and emotions and that it’s a good thing to have. This is all true. However, it’s limited; there’s so much more to mental health, and the more we know, the better we can take charge of our mental health to thrive. For World Mental Health Day, a look at what mental health is, sometimes in the context of what it is not.