Cat behavior...
If you have a pet, wether it be a cat, dog, bird, etc., for so long, you tend to get a good idea of how they're feeling when you observe their body language. For example: I know my cat is agitated when she is full-on wagging her tail. That's her way of saying "That's enough!" Pets can't talk so they use their body language to communicate.
Money isn't the root of all evil. Love of money is.