Should you keep your head empty? Or even, should you get things done.
"Maybe what you're doing is important, interesting, or useful; or maybe it isn't but it has to be done anyway. In the first case you want to get as much return as you can on your investment of time and energy. In the second, you want to get on to other things as fast as you can, without any nagging loose ends.". -----David
There might be things you want to keep in your head, or sometimes you can't help thinking it, like the vacation you are going to spend, romance you are going to develop. Just getting excited by just thinking about them.
And as you are doing these things, you don't just want get them down, nor you are doing them for a result. I mean, Come on, if you are ever doing things for a maximum possible return, then when are you going to enjoy it?