Most people feel guilty about unread books.
They see stacks of books on their shelves and think:
“I should have finished those.” But that assumes the only purpose of a book is to be finished. It isn’t. The Japanese even have a word for it: tsundoku (積ん読) — buying books and letting them pile up. Unread books show you what you don’t know yet. The more you learn, the more aware you become of what you haven’t read, haven’t studied, or haven’t thought through.
The shelf grows because your curiosity grows. So buy the book everyone keeps recommending.
Buy the one that caught your attention for a reason you can’t quite explain.

Let them stack up.