I like crossword puzzles. I try to complete one every day. It's supposed to keep the brain stimulated, but I'm not sure how much it does this. My mind is like a steel trap -- an old one, that is, rusty and hard to open! But I don't work them because it stimulates the mind. I work them because I enjoy doing so.
Sometimes I misread puzzle clues, and once in awhile I misunderstand them. Last night's 40 across clue was "on the shelves". The answer was a six-letter word that I knew would start with "U". My preconception for some reason or another was that "on the shelves" referred to books. Didn't say that, but that was what immediately came to my mind. So I kept thinking U N R E A D -- except that wouldn't work with other answers I was seeing. When I had enough surrounding answers to know the answer -- U N S O L D -- then I also understood the meaning of the clue. It wasn't about books on shelves (which wouldn't have to be "unread", by the way) but about merchandise on shelves.
It is easy for our preconceived ideas to get in the way and to give us wrong answers (and wrong actions). It is always good when we can move from a preconception back to reality and truth. Don't let preconceived ideas keep you from learning the truth. Find the truth and let it change your preconceived ideas. The truth will set you free.