If it impresses you enough, your brain will remember it. Especially for the overall "take home"-message, I'd trust the brain to remember it. While there is
a soft limit, you can add indefinitely at the risk of forgetting some (hopefully lesser) stuff.
If you want to improve the process beyond that, annotate the margins with a bar and stick a post it note on each page of the book that has something particularly noteworthy. I have a spatial memory, so I often know where in the book the page is that I'm looking for, and where on the page the quote was.
Some where detailed things you don't need to remember in perpetuity, you just need to remember e.g. the first author and year so you can look it up again once it's needed again. Some results will stick to your mind once you've looked them up a lot, so your brain can work like a "LRU cache" of sorts.
If you want to improve the process beyond that, annotate the margins with a bar and stick a post it note on each page of the book that has something particularly noteworthy. I have a spatial memory, so I often know where in the book the page is that I'm looking for, and where on the page the quote was.
Some where detailed things you don't need to remember in perpetuity, you just need to remember e.g. the first author and year so you can look it up again once it's needed again. Some results will stick to your mind once you've looked them up a lot, so your brain can work like a "LRU cache" of sorts.