[ozim]

I agree and also if I read similar concept in other book, even if I did not "remember it", I feel often dots connecting somehow in my brain and "ahh I just read that in other book". So it is more like gathering concepts than explicitly remembering that concept so I can quote it back when woke up past midnight.

If someone wants to quote book from his head go for Anki and drill, most of books I just want to internalize concepts.