On rereading
The second reading is the first one that is really yours.
Nabokov said that one cannot read a book, only reread it. The first time through, you are busy with the mechanics: who is speaking, where we are, what happens next. Only on the second reading can you see the shape of the thing.
I have started marking the date in the front of books each time I finish them. A few have three or four dates now. Those are the ones I know best, and the ones that still surprise me.