There is nothing for which I am more thankful than my "capacity to be grateful." This may seem a blatant effort to wriggle out of having to name one "thing" I appreciate most, and it is. But honestly, in my experience, the capacity for gratefulness truly trumps all reasons to be thankful.
The vast majority of us have reasons to be grateful galore. Just imagine: we have pairs of eyes, legs, ears, lungs and hands! If this isn't enough, we have a pumping heart and a mind-blowing brain; a blanket of skin, brilliant organs, and a host of finely-tuned senses -- never idle.