Just because you start a book doesn't mean you are going to finish it. Sometimes the thorns of life get in the way. However, when do you consciously choose not to finish a book?
It's easy to stop reading a boring book after a few pages, or a few chapters. But several times I've gotten around halfway through a book and wondered whether it was worth finishing (sometimes I did, sometimes I didn't). If you are halfway through a book and not enjoying it, do you owe it to yourself to finish (lest your previous reading be wasted--one of the reasons I'm still vegan)? Or, if you are halfway through a book and not enjoying it, do you owe it to yourself to STOP reading it and go on to read something better?