I feel thankful to have the ability to appreciate the good things in my life.

A birder walking beside you hears four species you would have walked straight past. Same air, same path. The difference is entirely in the training.

Appreciation works the same way. The good things in a life are mostly quiet and easily talked over, and noticing them is a learned skill rather than a mood.

Which is good news, because skills improve. Every time you stop and register something, the weight of a good knife, a friend's laugh, ten minutes with nothing scheduled, the threshold drops a little and more gets through the next day.