I was thinking the other day, how often do you find yourself thinking about other things in other times?

I was walking somewhere, I don't remember where, maybe Walmart, and I was thinking about what I'd be doing later that night, about my work the next morning, about making dinner and when my wife would be home, what my bill priorities were when I got paid next week, etc. But no thought, at least not until I realized what I was doing, was spared for where I was when I was there.

It makes me wonder, how much of our lives do we really, truly live, and how much do we spend watching the movie of what has already passed or what is yet to happen?