Kill your enemies with kindness.
It is possible to be kind and still maintain your boundaries. Being kind doesn’t mean that you have to allow yourself to be taken advantage of. Being kind means that you don’t cause intentional hurt to others either verbally, emotionally or physically. ~ Nancy Newman
Be kind because it’s a gift you give to someone. Don’t expect anything in return and you should not be hurt. Just enjoy the good feeling you get from being kind.