Let no thought pass incognito, and keep your notebook as strictly as the authorities keep their register of aliens

This is the fifth of Walter Benjamin’s thirteen rules for writing. I would love to know more about what this meant in practice to him. How often did he record his ideas? Where did he record them? How did their quantity and quality wax and wane in different circumstances? My conviction that blogging constitutes a technology of scholarly attentiveness rests on its capacity to habituate this practice.