From 2005:
Would we all be happier if we were capable of always enjoying to the fullest whatever we’re doing at the moment we’re doing it? Probably–but then we wouldn’t be quite human, would we? Such contentment is not in our natures: we keep one eye on the horizon, and sometimes both, which leaves neither free to see the moments that pass before us in review, each one crying out, Look at me! Aren’t I pretty?…
Read the whole thing here.