I keep a notebook in my pocket for writing down any thoughts and insights God may give. His thoughts are precious (Psalm 139:17), and these spiritual meteors will soon disappear if not put on paper.
In this regard Matt Haney has done us a wonderful service. Instead of paying a ridiculous amount of money for a pocket Moleskine you can now just make your own.
http://www.instructables.com/id/16-Page-Ruled-Pocket-Book-From-1-Piece-of-Paper-in/