Internally vs. Externally Referenced Zettels
It seems like the major use of a ZK is to collect important and high value knowledge from external sources (e.g. book, article, etc). Then, inside the ZK, relations between Zettel are made for learning and sense-making. So, a large portion Zettels serve the purpose of capturing and reflecting external facts and ideas; that is, stuff coming from other people or the outside world.
But is the ZK also a place for your own original thoughts and ideas? That is, do you think a ZK is also appropriate for developing an original idea that does not reference or response to some other piece of knowledge? In other words, if a Zettel has no links to an external source or even to other Zettel, does it belong in the ZK?
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