I keep a file called “ideas” in which I squirrel away articles, clippings, or personal thoughts that seem really smart, only I don't exactly know what to do with them. Every couple of years I look at the file and mostly end up baffled as to why I put any of these items in a file called “ideas” in the first place.
I also have a compilation of memorable quotes. Truth be told, these quotes are usually recorded during boring meetings ...