do you ever go back on reading a book you read already?

do you ever find yourself going back on a book you read some time ago&then find yourself going over a part that you felt you missed? you might stumble over a particular phrase or part that somehow escaped your sight the first time around. different events can lead you back to a particular read again. that is why I never throw or give away any of my books because I just have to go back on them. now i can recall where i was when i bought certain books or traced them down. so there are parts that i venture to repeat to myself&then put all things into perspective.so going back where you left that Bookmark or that piece of paper upon reading there is a new part to read that you may have forgotten.