 Here's an expression that's both true and false, and if you live the wrong meaning, it can ruin your life. Familiarity breeds contempt. It's true because someone that doesn't work to be aware and enjoy the things around them will turn every part of their life except their problems into a habit they don't think about. So they'll learn to resent even the idea that they should appreciate the good things that are constantly present in their life, because doing so would distract them from their problems.