As a rule, with me an unfinished [idea] is a thing that...

As a rule, with me an unfinished [idea] is a thing that might as well be rubbed out. It's better, if there's something good in it that I might make use of elsewhere, to leave it at the back of my mind than on paper in a drawer. If I leave it in a drawer it remains the same thing but if it's in the memory it becomes transformed into something else.