Does anyone else remember things, quotes, without any doubt that they’ve got it right? You’ll let that quote guide your life choices and share it with others to drop some wisdom. Then you’ll reread the original text years later and realise you misremembered the whole thing? Is it just me (and the libs) who can be so certain and yet so wrong?
This happens very often with quotes, which is why they need to be backed up with a source if attributed to someone.