Actually I m not really sure why. But God has allowed me to learn lots about Narcissist Personality Disorder these few years. Not only head knowledge but practically experienced handling them, both overt and covert alike. I give thanks to God that He protected me and went through the whole process with me. What's more, God also gave me a harmonious relationship with them now but at the same maintaining a safe boundary from them. Pray that God will continue to change them and heal them.