There’s a tendency in all of us to gather useful stuff and feel good about it. To collect is a reward in itself. As knowledge workers, we’re inclined to look for the next groundbreaking thought, for intellectual stimulation: we pile up promising books and articles, and we store half the internet as bookmarks, just so we get the feeling of being on the cutting edge.
A Zettelkasten is a device to extend your mind and memory so you can work with texts efficiently and never forget things again. Both permanent storage and interconnectedness are necessary to use the full potential of an archive for your notes. You need a permanent storage for your notes so they can give a cue for the things you want to remember. You also need to manually connect notes to create a web of notes which adjusts to the way your mind works.