Yen is a self-proclaimed 'strength finder' who has written nine books. He says he's good at giving details and facts without telling you, why did you catch this? Yen: Most people who write these types of books try to puff themselves up artificially and create this authority like, this is why you should listen to me. i found this a little bit refreshing, just because i don't really care who you are. I'll judge the ideas for the ideas.