The fix is not a better way of highlighting, but building in friction: forcing yourself to retrieve, explain or generate something without the source at hand. That feels harder and less successful in the moment, precisely because you can fail at it, and that friction is what leaves a lasting trace.

• Jeroen Sanders explaining why you need to reprocess things into your own words to truly internalize them.
  I feel like this applies as much to diary entries as it does studying.