That may sound like an odd thing to say. Most people assume gratitude is, at best, helpful and, at worst, harmless. But years ago, during a period of depression, I had a life full of things to be thankful for and couldn’t feel any of it. Not being able to feel grateful made me feel ungrateful, which only made things harder. The clinical term for this is anhedonia, a core symptom of major depressive disorder that’s linked to disruptions in the brain’s reward and motivation pat